Which of the following positively contributes to the genetic variation of a population gene pool? A change in the DNA sequence within a gene or chromosome of a living organism. Random fluctuationsin the frequency of appearance of a gene in a small population. A populations size is reduced for at least one generation. A new colony is established by a very small number of individuals away from a larger population.
Answers
The option that positively contributes to the genetic variation of a population gene pool is as follows: change in the DNA sequence within a gene or chromosome of a living organism (option A).
What is genetic variation?Genetic variation is the difference in DNA sequences between individuals within a population. Genetic variation is what makes us all unique, whether in terms of hair colour, skin colour or even the shape of our faces.
The multiple sources of genetic variation include the following;
mutationgenetic recombinationMutations, which is the change in the DNA sequence of a population, are the ultimate sources of genetic variation, but other mechanisms, such as genetic drift, contribute to it, as well.
Therefore, it can be said that option A contributes positively to genetic variation in a population.
Learn more about genetic variation at: https://brainly.com/question/848479
#SPJ1
Related Questions
Are there any parts of the human body that get oxygen directly from the air and not from the blood?
Answers
other then the lungs no all of the body parts get oxygen from blood cells
If your body gets too cold, then your muscles start to shiver, which helps raise body temperature *
True or False?
Answers
Answer:
True
-----------------
Because skeletal muscles to bring about rapid contractions that generate heat.
In a certain population of rabbits, the allele for brown fur
is dominant over the allele for white fur. If 10 out of 100
rabbits have white fur, what is the allele frequency for
the recessive allele?
The Hardy-Weinberg equation is:
[homozygous dominant]2 + 2[heterozygous] +
[homozygous recessive]- = 1
• A. 0.32
• B. 0.10
• C. 0.95
• D. 0.90
SUBMIT
Answers
The allele frequency for the recessive allele is B. 0.10. Thus, option "B" is correct.
How, explain your answer?The Hardy-Weinburg equation is p + q = 1, or p^2 + 2pq + q^2 = 1, where p is dominant and q is recessive.
If 10 out of 100 rabbits have white fur, 10% of the rabbits have white fur. Therefore, 90% of the rabbits have brown fur, which can be substituted into the first equation to becoming 0.9 + 0.1 = 1. Now that we know what p and q equal, we can solve the rest of the equation.
0.9^2 = 0.81
0.9 * 0.1 * 2 = 0.18
0.1^2 = 0.01
Therefore, the allele frequency of the recessive allele is 0.1.
To learn more about Hardy-Weinberg equation click here:
https://brainly.com/question/4111398
#SPJ1
A) what is a niche?
B) what is meant by the term 'ecosystem'?
Answers
Answer:
A niche is the “job” or role an organism plays in its community.
Ecosystem refers to a biological community of interacting organisms and their physical environment.
Explanation:
which of the following statements best describes the change in body composition from twenty years of age to seventy years of age?
Answers
Fat increases, protein decreases and decrease in other body compounds describes the change in body composition from twenty years of age to seventy years of age.
The change in body composition from twenty years of age to seventy years of age is significant. As we age, we tend to lose muscle mass and gain fat mass. This can lead to a decrease in strength, mobility, and overall physical function. This process is known as sarcopenia and can be attributed to a variety of factors, including hormonal changes, decreased physical activity, and poor nutrition. It is important to maintain an active lifestyle and consume a balanced diet to minimize the effects of sarcopenia and maintain a healthy body composition as we age. Additionally, resistance training and regular exercise can help to preserve muscle mass and promote overall health.
To learn more about protein click here https://brainly.com/question/31017225
#SPJ11
PLEASE HELP ITS ABOUT VOLCANOS
Answers
Answer:
Shield volcanoes have low profiles and broad distributions of lava flows while composite volcanoes can have smaller channels of rising magma called di.
Explanation:
Shield volcanoes have low profiles and broad distributions of lava flows while composite volcanoes can have smaller channels of rising magma called di.
Describe the characteristics of eubacteria.
Answers
There have been many oil spills over the years. Perhaps you heard or learned about the Gulf oil spill in the U.S. that happened in April 2010? A spill like this that is close to land causes many problems for the environment and makes it difficult to clean up. As little as three gallons of oil can spread to make a slick mess covering one acre of the ocean's surface. With the Gulf oil spill, it's estimated that 200,000 gallons a day spilled into the ocean. Oil spills like this are very damaging, but they aren't the only source of oil that is polluting our waters. Rain washes particles from air pollution into the ocean. And one of the biggest sources of oil polluting is from the oil people put down their drains every day or runoff from parking lots. Oil and water don't mix—perhaps you have heard this before? And you probably know that oil is sticky and greasy. This makes it even more difficult to clean up. Let's take a look at the chemical properties of oil and water to see why. Each water molecule is made of two hydrogen atoms and one oxygen atom - H2O. When the two hydrogen atoms bond with the oxygen, they attach to the top of the molecule, rather like Mickey Mouse ears. This molecular structure gives the water molecule polarity, or a lopsided electrical charge that attracts other atoms. Because of their polarity, water molecules are strongly attracted to one another. This also gives water its unique properties. Oil is made of more complex molecules, containing carbon and hydrogen. Oil molecules are non-polar, meaning they don't stick together like water molecules do. Oil is thick and heavy, yet its molecules are spread farther apart, lowering the density. Because it has a lower density, oil floats on water's surface.
Answers
Answer:
mddmdnxxnxnxnxnxbbxxbhcxjsjsjwuwususussjdjxjxjxjxj
Glutamine and asparagine residues in proteins faciltate interactions with DNA through:
a. Hydrogen bonding with adenine
b. lonic bonding with backbone phosphate groups
c. intercataton between bases
d. Allof the above
Answers
Glutamine and asparagine residues in proteins facilitate interactions with DNA through ionic bonding with backbone phosphate groups. The correct option is b.
What are glutamine and asparagine residues?Glutamine and asparagine are amino acids that contain amide side chains. These two amino acids are frequently found in DNA-binding proteins. The side chains of these amino acids interact with the DNA backbone by forming hydrogen bonds with the phosphate groups.
Asparagine has a short, polar side chain that is capable of forming two hydrogen bonds with the DNA backbone phosphate group. The long, polar side chain of glutamine is capable of forming three hydrogen bonds with the DNA backbone phosphate group. Therefore, asparagine and glutamine are critical for DNA-binding proteins, especially those that bind to DNA via its backbone.
Both glutamine and asparagine play a critical role in protein-DNA interactions. They facilitate interactions by forming ionic bonds with the backbone phosphate groups. Ionic bonding is a type of chemical bond that involves the electrostatic attraction between ions of opposite charge. In this case, the negatively charged phosphate groups on the DNA backbone are attracted to the positively charged side chains of glutamine and asparagine.
For more such questions on Ionic bonds.
https://brainly.com/question/11527546#
#SPJ11
where do most digestive enzymes carry out their action?
Answers
Most digestive enzymes carry out their action in the gastrointestinal tract.
Digestive enzymes are proteins that facilitate the breakdown of food molecules into smaller components, allowing for their absorption and utilization by the body. These enzymes are produced and secreted by various organs along the gastrointestinal tract, which includes the mouth, esophagus, stomach, small intestine, and large intestine.
The process of digestion begins in the mouth, where the enzyme amylase starts breaking down carbohydrates. In the stomach, the enzyme pepsin helps break down proteins into smaller peptides. However, the majority of digestion and absorption occurs in the small intestine. The pancreas secretes enzymes such as lipase (for fats), amylase (for carbohydrates), and proteases (for proteins) into the small intestine. The intestinal wall also produces enzymes like sucrase, lactase, and maltase to further break down carbohydrates into simple sugars.
By carrying out their action in the gastrointestinal tract, these digestive enzymes play a crucial role in ensuring the effective breakdown and absorption of nutrients from the food we consume.
learn more about gastrointestinal tract here:
https://brainly.com/question/25882744
#SPJ11
Most digestive enzymes carry out their action in the small intestine.
In the digestive system, enzymes play a crucial role in breaking down food into smaller molecules that can be absorbed by the body. These enzymes are produced by various organs, including the salivary glands, stomach, pancreas, and small intestine. Each enzyme has a specific function and acts on different types of nutrients.
When it comes to the location of enzyme action, most digestive enzymes carry out their function in the small intestine. The small intestine is a long, coiled tube that is responsible for the majority of nutrient absorption in the body. It is lined with tiny finger-like projections called villi, which greatly increase the surface area available for absorption.
The enzymes that are involved in the digestion of carbohydrates, fats, and proteins are released into the small intestine from the pancreas and the cells lining the small intestine. Once in the small intestine, these enzymes break down the complex molecules into simpler forms that can be absorbed by the villi and transported into the bloodstream.
Therefore, it is in the small intestine where most digestive enzymes carry out their action, facilitating the breakdown of food into nutrients that can be utilized by the body.
Learn more:About digestive enzymes here:
https://brainly.com/question/30312574
#SPJ11
Three conditions that influence how well an enzyme will work
Answers
Please can someone help me write a note on cell theory
Answers
Answer:
The cell theory states that:
1) The cell is the structural and functional unit of life.
2) All living organisms are made up of cells.
3) All cells come from previously existing cells.
4) There is no life apart from the life of cells
5) All living things are either single cells (unicellular) or group of cells (multicellular)
What is meaning of the word resiliency in this context save the coral reefs?
Answers
Answer: an ability to recover from or adjust easily to adversity or change
Explanation:meaning of the word resiliency in this context save the coral reefs is an ability to recover from or adjust easily to adversity or change
An operon is a group of genes under the control of a single promoter. Match each type of operon with the descriptions. Inducible Repressible Constitutive Transcription is turned on when a specific molecule is present Sufficient amounts of the gene product inhibit further transcription. The amount of gene product is constant
Answers
The match for each type of operon with the descriptions is as follows:
Inducible Operon: Transcription is turned on when a specific molecule is present.
Repressible Operon: Sufficient amounts of the gene product inhibit further transcription.
Constitutive Operon: The amount of gene product is constant.
In an inducible operon, the presence of a specific molecule, called an inducer, activates the transcription of the genes. This type of operon is typically involved in response to environmental signals, and the presence of the inducer molecule triggers the activation of gene expression.
In a repressible operon, the gene product, often a specific end product of a metabolic pathway, acts as a corepressor to inhibit further transcription. When the concentration of the end product is sufficient, it binds to a regulatory protein called a repressor, which then binds to the operator region of the operon, preventing the transcription of the genes.
A constitutive operon is characterized by constant gene expression. The genes in a constitutive operon are continually transcribed and translated, producing a constant amount of the gene product. These operons are typically involved in the synthesis of essential cellular components or housekeeping functions.
It's important to note that operons are mainly found in prokaryotic organisms, where genes are organized into operon structures. In eukaryotic organisms, gene regulation is more complex and typically involves the interaction of various regulatory elements.
Learn more about Inducible Operon here:
https://brainly.com/question/2562849
#SPJ11
What do temperature, wind and rain have in common?
Answers
Temperature, wind, and rain are all elements of weather. They are all important factors in determining the overall conditions of the atmosphere and can have a significant impact on our daily lives. Temperature measures the degree of warmth or coldness of the air, wind refers to the movement of air from one place to another, and rain is precipitation that falls from the clouds. All three of these factors are interconnected and can influence each other, such as how wind can affect the feeling of temperature and how rain can be driven by strong winds. Together, they contribute to the complex system of weather patterns that shape our world.
What is Climate system ?
Climate is determined by a region’s climate system. A climate system has five major components: the atmosphere, the hydrosphere, the cryosphere, the land surface, and the biosphere.
The atmosphere is the most variable part of the climate system. The composition and movement of gases surrounding the Earth can change radically, influenced by natural and human-made factors.
To know more about Temperature :
https://brainly.com/question/13694966
#SPJ11
Which statement describes an experimental procedure that is properly controlled? OA. Twenty mice are fed a diet high in protein and their weights are measured every day for six weeks. OB. One hundred watermelon seeds are planted in full sunlight, while 100 pumpkin seeds are planted in partial sunlight. OC. Fifteen tomato plants are given 5 mL of a saltwater solution every day, another 15 tomato plants are given 5 mL of plain water, and each plant's growth is measured each week. OD. A survey shows the 10 best action movies made in the past five years.
Answers
Answer:The experimental procedure that is properly controlled is option C.
In this experimental procedure, two groups of tomato plants are used, with one group receiving the saltwater solution and the other receiving plain water. This allows for a comparison between the two groups to determine whether the saltwater solution has an effect on the growth of the tomato plants.
Additionally, each plant's growth is measured each week, which allows for a quantitative analysis of the data. By measuring the growth of each plant in both groups, the experimenter can control for variables such as soil quality, sunlight exposure, and water availability, and attribute any differences in growth to the variable being tested (the saltwater solution).
In contrast, the other options (A, B, and D) either do not have a control group or do not manipulate a specific variable while controlling for other variables, making it difficult to draw conclusions about causation.
Explanation:
Answer:
C
Explanation:
Near the end of both March and September,
a. spring begins in both hemispheres.
b. the sun's rays strike Earth with the same intensity everywhere.
c. Earth's axis is no longer pointing at the North Star.
d. neither end of Earth's axis is tilted toward the sun.
Answers
Answer:
A. Spring begins in both hemispheres.
Explanation:
There are 2 equinoxes in a year. One on 21st March and one on 22nd September. This is when both side of the hemispheres have roughly the same amount of daytime and nighttime.
Tetrodotoxin (TTX) and botulinum toxin (BTX) are two neurotoxins that causes paralysis. What is(are) the underlying mechanism(s)? a) Both block the voltage-gated Na+ channels to inhibit the firing of
Answers
Tetrodotoxin (TTX) and botulinum toxin (BTX) are two neurotoxins that cause paralysis. The underlying mechanisms are given below:a) Both block the voltage-gated Na+ channels to inhibit the firing of action potentials.
Both tetrodotoxin (TTX) and botulinum toxin (BTX) block voltage-gated Na+ channels to inhibit the firing of action potentials, which results in paralysis. Tetrodotoxin (TTX) is a potent neurotoxin that is found in pufferfish, whereas botulinum toxin (BTX) is produced by the bacteria Clostridium botulinum.
Both neurotoxins inhibit the release of neuro transmitters from nerve endings in muscles. TTX inhibits the release of acetylcholine (ACh) by blocking voltage-gated Na+ channels in the axons of nerve cells that supply the muscles. Botulinum toxin (BTX) prevents the release of ACh from nerve endings by blocking the docking of vesicles containing ACh with the plasma membrane of the nerve ending. As a result, muscle contraction is prevented, leading to paralysis.
To know more about neurotoxins visit:
https://brainly.com/question/13050036
#SPJ11
Sea urchins belong to the echinoderm phylum. Adult sea urchins have spines that extend outward from their exoskeleton, but as larvae, the sea urchins have only an exoskeleton made from spicules. The spines offer protection against predators. The population size of sea urchins is low in relation to the carrying capacity of the area. As a result, the sea urchins are Multiple choice question. A) r-strategists that allocate much energy toward parental care. By-strategists that allocate energy to producing many young. C) density-independent, because there is plenty of energy. D) irruptive, because their numbers crash quickly.
Answers
Complete question:
Sea urchins belong to the echinoderm phyla. Adult sea urchins have spines that extend outward from their exoskeleton, but as larvae, the sea urchins have only an exoskeleton made from spicules. The spines offer protection against predators. Sea urchins typically spawn near the surface. Males release sperm into floating plankton, then female urchins release between eight and 20 million eggs in the same area. The jelly-like coating on the eggs attracts the sperm, and when the two meet, they create an embryo that starts dividing into new cells within minutes.
Based on the information the population size of sea urchins is low in relation to the carrying capacity of the area. As a result, the sea urchins are
A) r-strategists that allocate much energy toward parental care.
B) r-strategists that allocate energy to producing many young.
C) density-independent because there is plenty of energy.
D) irruptive, because their numbers crash quickly.
Answer:
B) r-strategists that allocate energy to producing many young.
Explanation:
According to the given information, this species expresses survival curve type III, characteristic of r-strategists. Males and females release many gametes into the sea. If these gametes get to meet, they produce the embryo that starts developing. But there are high chances for these new organisms to die. Significant mortality during the early stages of life is expected for the species. The few individuals that manage to reach the later life stages, getting to survive, usually have a long life. These species produce many gametes to release, which results in the production of many offspring simultaneously. However, adult individuals provide no parental care. Their success in reproduction depends on the number of surviving descendants.
Males release sperm into floating plankton, Female urchins release between eight and 20 million eggs in the same area,When they meet, sperm and egg create an embryo that starts dividing into new cells within minutes.We might also mention that the population size is under the carrying capacity. r-strategist choose to live in areas with only a few individuals, where nitches are hardly occupied.
It is when organisms compete for the same resources and can occur within or
between species.
Answers
Answer:
The answer is Intraspecific competition.
Explanation:
The indication of rivalry amidst organisms of the same species is called intraspecific competition.
1. The ______________ Boundary is the turning point in earth's history, when dinosaurs vanished.
Answers
The K-T extinction
Explanation:This extinction event marks a major boundary in Earth's history, the K-T or Cretaceous-Tertiary boundary, and the end of the Mesozoic Era. The K-T extinctions were worldwide, affecting all the major continents and oceans.
Which is a tough and rigid layer that surrounds plant cells, as well as some algal and bacterial cells?
cell wall
centriole
nucleus
cell membrane
Answers
The tough and rigid layer that surrounds plant cells, as well as some algal and bacterial cells, is called the cell wall. Therefore, the correct statement is option A.
What are the functions of cell wall?The cell wall provides mechanical support to the cell, thereby, protecting it from damage caused by external factors. The cell wall consists of complex carbohydrates, such as cellulose, lignin, etc.
The cell membrane is selectively permeable, and the cell wall is porous allowing the passage of some molecules. The cell wall also helps in cell communication and signaling.
The cell wall determines the shape of the cell and helps in the regulation of growth and development. The thickness and composition of the cell wall change with respect to different environmental conditions and helps in the survival and function of many types of cells.
Therefore, the tough and rigid layer that surrounds plant cells is called the cell wall.
Learn more about cell wall here:
https://brainly.com/question/29209742
#SPJ7
i need sleep help me out
Answers
One cell, which performs all of the processes required by the organism, makes up a unicellular organism.
The correct option is (a) performs all of the function
Explain features of unicellular organisms?A single cell makes up a unicellular creature, also referred to as a single-celled organism, as opposed to a multicellular organism, which is made up of numerous cells. Prokaryotic and eukaryotic organisms are the two broad categories into which all organisms fall. Bacteria and archaea are two divisions of unicellular prokaryotes. While most eukaryotes have many cells, others do not, including protozoa, single-celled algae, and single-celled fungi. The earliest known forms of life are believed to be unicellular organisms, with the emergence of early protocells possible between 3.8 and 4.0 billion years ago. While certain prokaryotes are specialized cells with unique tasks, they do not always live in colonies. Together, these organisms must carry out all necessary life activities for each cell to survive.Learn more about the Unicellular organism with the help of the given link:
https://brainly.com/question/27753005
#SPJ13
Which is an inherited trait?
flavor of an apple from a particular tree
hierarchical status of a wolf in a pack
ability to ride a bike
interest in stamp collecting
Answers
Answer:
a flavor of an apple from a particular tree
Explanation:
Answer: The correct answer is flavor of an apple from a particular tree
Explanation: Confirmed correct
in humans, having a hitchhikers thumb is a recessive trait
Answers
Answer:
yes, a person must inherit two copies of the gene for it to be expressed.
Explanation:
Having a hitchhiker's thumb is a genetic trait that is passed down from parents to their children. An individual must inherit two copies of the gene for it to be expressed.
This means that if one parent has a hitchhiker's thumb and the other parent does not, their children will not necessarily have the trait, but may inherit one copy of the gene for the trait. If both parents have a hitchhiker's thumb, their children are more likely to have the trait.
Diagram the plasma membrane; label each component.
Answers
The plasma membrane, also known as the cell membrane, is the membrane found in all cells that separates the cell's interior from its surroundings.
What is the plasma membrane about?A cell wall is attached to the plasma membrane on the outside of bacterial and plant cells. Most plasma membranes are approximately 50% lipid and 50% protein by weight, with glycolipids and glycoproteins accounting for 5 to 10% of the membrane mass.
The plasma membrane shields the cell from its surroundings, facilitates cellular transport, and transmits cellular signals. The plasma membrane structure is described by the fluid mosaic model as a mosaic of phospholipids, cholesterol, proteins, and carbohydrates.
Learn more about plasma membrane on:
https://brainly.com/question/734740
#SPJ1
Nociceptors are for {{c1::pain}}
Answers
Nociceptors are sensory receptors that respond to tissue damage or potential damage, and are primarily responsible for detecting and transmitting signals related to pain.
Nociceptors are specialized nerve endings that are activated by various stimuli, including mechanical, thermal, and chemical stimuli. When nociceptors are stimulated, they generate electrical impulses that are transmitted to the spinal cord and brain, where they are interpreted as pain sensations. Nociceptors are found throughout the body, including in the skin, muscles, bones, and internal organs. They are essential for protecting the body from potential harm by alerting the nervous system to potential injury or damage. However, nociceptors can also become overactive or hypersensitive, leading to chronic pain conditions such as neuropathic pain and fibromyalgia.
To know more about Nociceptors visit :
https://brainly.com/question/28145290
#SPJ11
_____ is an initiative to help address the global water crisis.
Answers
The initiative that helps address the global water crisis is known as Safe Water System. Option C is correct.
Safe Water System is an initiative to help address the global water crisis.
The Safe Water System is a low-cost, proven, and effective intervention for the provision of safe water at the household level. It's a set of equipment and instructions for purifying water and storing it safely. It reduces the risk of diarrheal illness by up to 89 percent by eliminating bacterial and viral pathogens, such as cholera, salmonella, and E. coli, as well as reducing diarrhea incidence by up to 50 percent.Several countries around the world are in the midst of a water crisis.
Climate change, drought, and overuse are all factors contributing to the world's dwindling water resources.
As a result, it is critical to focus on ways to save water. People in developing countries often lack access to safe drinking water, and they are unable to use sanitation services.
Thus, the Safe Water System is one such initiative that is a proven and cost-effective solution to this problem.
To learn more about bacteria :
https://brainly.com/question/6941760
#SPJ11
Your eldest sister instructed you to pack her clothes because she is going to an urgent
out of country seminar and she is running out of time in doing this. What are you going
to do?
Answers
I will follow my eldest sister's instruction and pack her clothes as quickly and efficiently as possible.
I will start by gathering all of the necessary clothing items that she will need for the seminar, including any formal or business attire, as well as any casual clothes for downtime. I will also make sure to pack any necessary toiletries and accessories. I will then fold the clothes neatly and pack them into her suitcase, making sure to maximize the space and avoid any wrinkles or damage to the clothes. Once everything is packed, I will double check to make sure that I have not forgotten anything and that everything is secure before closing the suitcase and giving it to my sister.
Learn more about Clothing:
https://brainly.com/question/24799048
#SPJ11
11. URINE FORMATION:
Complete the table from the bar graphs with the components of urine and then answer the questions:
URINE
SWEAT
water
Mineral salts
Inorganic substances
a. Which of the 2 substances contains more water?
_______________
b. Which contains more mineral salts? __________
c. Which contains more inorganic substances? _______________
d. Do urine and sweat have the same function? ____
Explain the function of each of them:
12. The main mechanisms for regulating urinary elimination are those derived from the effects of hormones: ANTI-DIURETICS (ADH) and ALDOSTERONE.
Answers
1) Urine and sweat contain the same a amount of water
2) Sweat contains more mineral salts
3) Sweat contains more inorganic substances
4) The function of sweat is to cool the body and while the function of the urine is the removal of nitrogenous waste from the kidney
What is the water content of urine and sweat?
The water content of urine is typically between 95-99% water, with the remaining 1-5% consisting of various waste products, such as urea, creatinine, and electrolytes. The water content of urine can vary depending on an individual's hydration status, with more concentrated urine being produced when the body is dehydrated, and more dilute urine being produced when the body is well hydrated.
The water content of sweat is also typically between 95-99% water, with the remaining 1-5% consisting of various electrolytes, such as sodium, potassium, and chloride. The amount of sweat produced by the body can vary greatly depending on physical activity, temperature, and hydration status, with more sweat being produced when the body is overheated or dehydrated.
Learn more about Urine:https://brainly.com/question/23278139
#SPJ1