7) Sources of genetic variation in sexually reproducing organisms include(s) which of the following?
A) crossing-over in prophase I of meiosis
B) independent assortment in metaphase I of meiosis
C) fertilization
D) All of the choices are sources of genetic variation.
E) None of the choices are sources of genetic variation.
Answers
In sexually reproducing organisms, crossing-over during prophase I of meiosis, independent assortment during metaphase I of meiosis, and fertilisation are the origins of genetic variation. All of the options are therefore sources of genetic diversity.
What factors contribute to genetic diversity in asexual reproduction?In asexual organisms, mutation is the only source of variety. In sexually reproducing organisms, mutations that occur during the development of germ cell lines are the main source of variety.
What causes genetic variation in a population with sexual reproduction?The main causes of genetic variation are the three factors connected to sexual reproduction listed below: stepping aside (in prophase I) a random chromosomal assembly that combines gametes from many parents (in metaphase I).
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Related Questions
deadlock-avoidance algorithms in general result in better utilization of resources since the resources are used as much as they can be. group of answer choices true false
Answers
The given statement "deadlock-avoidance algorithms generally result in better resource utilization as they prevent deadlocks while maximizing resource usage" is true.
Deadlock-avoidance algorithms, such as Banker's algorithm, proactively prevent deadlocks by ensuring that resource allocation remains safe and does not lead to circular waits or deadlocked states.
These algorithms work by monitoring and controlling resource allocation, thus making the best possible use of available resources.
As a result, the system can operate at higher efficiency levels without the risk of deadlocks.
In comparison to other deadlock-handling methods like deadlock prevention or detection and recovery, deadlock-avoidance algorithms provide a more effective solution by maintaining resource utilization and minimizing wasted resources due to deadlock occurrences.
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True. Deadlock-avoidance algorithms aim to prevent the occurrence of deadlocks in a system by ensuring that resources are allocated in a safe and efficient manner.
By dynamically checking the resource allocation state, these algorithms are able to avoid situations that could lead to deadlocks, thus allowing resources to be utilized as much as possible. As a result, the overall utilization of resources is improved, which leads to better system performance. Therefore, it is true that deadlock-avoidance algorithms in general result in better utilization of resources.
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In the Gulf of Mexico, there is a large area off the coast of Louisiana that cannot support most marine life. In this area, fresh water from the Mississippi River carries excess phosphorus and nitrogen from lawn care and agriculture into the Gulf of Mexico. Algae in the water use these nutrients to grow rapidly, creating algal blooms in the water. When the algae die, they sink to the bottom of the Gulf, where bacteria use much of the oxygen in the water to decompose the algae.
Dissolved Oxygen Levels in Gulf of Mexico Dead Zone
map showing dissolved oxygen levels in water, with areas ranging from 0 mg/L to about 6mg/L
Image courtesy of NOAA
Marine organisms trying to live in the water may not get enough oxygen to survive. Based on this description, which of the following is true?
A.
Nonliving factors, such as the amount of nutrients available, significantly affect the survival of organisms in their environment.
B.
Living factors, such as the number of producers present, play the largest role in the survival of organisms in an ecosystem.
C.
The supply of any nonliving factor supports or limits growth of all organisms in an ecosystem in the same way.
D.
The number of organisms of each type in an ecosystem depends on living factors but not on nonliving factors.
i dont know the answer??
Answers
Answer:
A. Nonliving factors, such as the amount of nutrients available, significantly affect the survival of organisms in their environment.
Explanation:
The death of the algae kills oxygen, both are non-living factors
can someone please help me!! ASAP!!
Thank uuu!!!
Answers
ANSWER
A
Explanation:
no explanation
Step-by-step explanation:
which of the following is/are true about polychaete worms?
Answers
Polychaete worms are marine annelids characterized by their numerous chaetea.
They are important in aquatic ecosystems as a food source for many species and as a means of cleaning sediments. Additionally, they serve as indicators of ecosystem health.
They are segmented, meaning that their bodies are divided into multiple sections, which gives them greater flexibility and allows them to adapt to different environments.
Some polychaete worms are also known to have bioluminescent properties. Overall, polychaete worms are important and diverse members of marine ecosystems.
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How do homologous features display evidence of divergent evolution
Answers
answer
Homologous structures are present in many different species that share a common ancestor. the structure are anatomically similar and persist in the different species.
This is evident of divergent evolution because it shows that different animals come from a common ancestor but evolve o become different species from each other.
even though they have the same tissue layers as other large vessels, venules and veins are thinner because they have a thinner layer of
Answers
Even though they have the same tissue layers as other large vessels, venules and veins are thinner because they have a thinner layer of smooth muscle in their tunica media. This makes them more compliant and able to expand and contract to accommodate changes in blood flow and pressure. Additionally, venules and veins have a larger lumen compared to arteries, which also contributes to their thinner overall structure.
Venules and veins are indeed thinner than other large vessels, such as arteries, despite having the same tissue layers. The reason for this is that they have a thinner layer of smooth muscle and connective tissue, which contributes to their reduced wall thickness. This allows for greater flexibility and capacitance, enabling them to store and return blood back to the heart efficiently.
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Even though they have the same tissue layers as other large vessels, venules, and veins are thinner because they have a thinner layer of connective tissue.
Why do venules and veins have a thinner layer of connective tissue?
This is because venules and veins do not experience the same level of pressure as arteries do. They also do not need to conduct blood flow with the same force, as they are returning blood back to the heart rather than delivering it to the body's tissues.
The thinner connective tissue layer allows for more flexibility and easier expansion, which is important for accommodating changes in blood volume and pressure. Venules and veins are thinner because they have a thinner layer of smooth muscle and connective tissue. This allows them to accommodate lower pressure and maintain blood flow through conduction, while still providing structural support.
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Carly has wavy hair. Her father has straight hair, and her mother has curly hair. Which type of inheritance pattern is responsible for Carly’s wavy hair?
A.
codominance
B.
dominant
C.
incomplete dominance
D.
polygenic
E.
recessive
Answers
Answer:
Incomplete Dominance
Explanation:
What species of animal took residence in a georgia college library and also made a new home in central park?
Answers
The animal species that took residence in a Georgia college library and also made a new home in Central Park is the Eastern Gray Squirrel (Sciurus carolinensis).
What happened with the Eastern Gray Squirrel?In 2019, a group of Eastern Gray Squirrels took residence in the library of the University of North Georgia's Gainesville campus. The squirrels were discovered by library staff who noticed that they had made nests in the building's bookshelves. The squirrels became somewhat of a local attraction, with students and staff taking photos and videos of the squirrels in the library.
The Eastern Gray Squirrels are a common sight in Georgia, and their adaptability and intelligence make them well-suited to living in both natural and urban environments.
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I don’t know the answer so I need help,yeah,I’m confuse like you
Answers
Answer:
The answers are in order all you have to to do is put the letter in
Explanation:
Ur welcome
def need help, science testtt!!
Answers
Answer:
it's d
bc it occurs when sedimentation occurs when eroded stuff compact them together
help pleaseeeee and please don’t waste my time by saying that ydk :) ty
Answers
Answer:
1. Arsenic, benzene, formaldehyde, lead, and mercury are just a few of the more than 70 cancer-causing chemicals in cigarette smoke.
2.They work, for instance, to keep the airways clear of mucus and dirt, allowing us to breathe easily and without irritation. They also help propel sperm.
3.Spirometry measures how much air you can breathe in and out. It also measures how fast you can empty the air out of your lungs. Spirometry helps diagnose breathing problems such as asthma and COPD.
4. Tar causes cancer of the lungs, mouth and throat.
Q2) The function of cilia is to move water relative to the cell in a regular movement of the cilia. This process can either result in the cell moving through the water, typical for many single-celled organisms, or in moving water and its contents across the surface of the cell.
Q3) Lung volume measurement can be done in two ways:
The most accurate way is called body plethysmography. You sit in a clear airtight box that looks like a phone booth. ...
Lung volume can also be measured when you breathe nitrogen or helium gas through a tube for a certain period of time.
Q4) Tar contains most of the cancer-causing and other harmful chemicals found in tobacco smoke. When tobacco smoke is inhaled, the tar can form a sticky layer on the inside of the lungs. This damages the lungs and may lead to lung cancer, emphysema, or other lung problems.
Compared to historical trends, what is different about
contemporary climate change?
A. It’s occurring faster
B. It’s a warning trend
C. It’s affecting plants and animals
D.it’s caused by atmospheric changes
Answers
Answer:
c
Explanation:
Large bodies of water help to stabilize air temperatures. An ice cube cools water by adding coldness. Evaporative cooling prevents terrestrial organisms from overheating. Water is slower to warm up or cool off than most materials.
Answers
Answer:
Water is slower to heat than most materials.
Explanation:
There is a physical property called "specific heat". This property determines the amount of temperature necessary to change 1ºC in the temperature of the materials. The higher the specific heat of the material, the slower it will heat up.
The water has an extremely high specific heat, which means that it will slowly heat up to an extremely high temperature. The specific heat of the water is greater than most materials and this explains why high variations and external temperature changes almost do not cause changes in the water of the picisnas, for example.
Why is it important for scientists to be objective? O A. So they can get more funding from companies OB. So they can become famous C. So they can earn more money ) D. So they can explain events in the natural world
Answers
Which organisms utilize cellular respiration for energy production?
A. Prokaryotic Cells
B. Eukaryotic Cells
C. Both Prokaryotic and Eukaryotic Cells
D. Only Animal Cells
Answers
If a 50 kg dog accelerates at 6 m/s2, what is the applied force?
Answers
Answer:
F= m × a
F = 50kg × 6 m/s²
F = 300N (calculate again lol)
How are the two patterns
related?
Answers
Answer:
what are the two patterns?
Answer:
Yes what were the two pattern ❓❔
HOMEWORK! What do these mean?
Answers
So biodiversity is the different and varied living things such as animals and plants that lives on earth
Explain convection in earths mantle
Answers
Answer:
Mantle convection is the very slow creeping motion of Earth's solid silicate mantle caused by convection currents carrying heat from the interior to the planet's surface.
Explanation:
each chromosome in this homologous pair possesses a different allele for flower color. which statement about this homologous pair of chromosomes is correct?
Answers
The correct statement is the homologous chromosomes represent the maternal and paternal chromosomes.
These chromosomes represent maternal and the chromosomal pattern indicates the presence of two chromosomes. This represents the two sets of conversion materials used by Gan. From these descriptions, the chromosome composed of these two chromosomes is the chromosome in genetics, the SLAM model, we call the maternal chromosome, and the chromosome inherited from the father is called the paternal chromosome. So this is still a chromosome and colored. They are formed by DNA replication and non-systems, not Tacoma nonsense.
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The structural continuity between the cornea and the sclera is called:.
Answers
Explanation:
i think Limbus ..........
Which best describes when the body is working on counteracting an effect?
when hormone levels in the body are all equal
during a negative feedback loop
during a positive feedback loop
when the hypothalamus is signaling the pituitary gland
Answers
Answer: the answer is B or during the negative feedback loop.
Explanation: the body is trying to counteract the negative feed back.
During a negative feedback loop, the body is working on counteracting an effect. thus, option B is correct.
What are the differences between negative and positive feedback loops?Positive feedback loops amplify or exacerbate changes, moving a system farther from equilibrium and making it more unstable. Negative feedbacks tend to dampen or buffer changes; this tends to hold a system to some equilibrium state making it more stable.
A self-regulating system is a negative feedback loop, often known as an inhibitory loop. Increased output from the system restricts future production in a negative feedback loop. When the quantities of particular proteins or hormones in the body get too high, the body reduces their production.
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Which statement best compares the functions of chloroplasts and cytoplasm in a plant cell?
O A. Chloroplasts contain chlorophyll and make food for the plant cell, while the cytoplasm contains the water and nutrients needed for
the plant cell.
OB. Chloroplasts contain water and nutrients needed for the plant cell, while the cytoplasm contains chlorophyll and makes food for the
plant cell.
O C. Chloroplasts contain the DNA of the plant cell, while the cytoplasm contains broken down food and releases energy to the plant
cell.
O D. Chloroplasts antain broken down food and release energy to the plant cell, while the cytoplasm contains the DNA of the plant cell.
Answers
Answer:
The statement that best compares the functions of chloroplasts and cytoplasm in a plant cell is: A. Chloroplasts contain chlorophyll and make food for the plant cell, while the cytoplasm contains the water and nutrients needed for the plant cell.
Can someone pleaseee help me with this It’s urgent! It’s multiple choice! Plsssss help (20 points)
Answers
Answer:
Explanation:
8/c
9/c
10/c
12/b
13/a
14/b
and i am not sure about 12/9
How much does a cloud weigh
Answers
Answer:
about 500,000 kilograms
Answer:
about 1.1 million pounds
Explanation:
Cancer cells are different because they don't enter the G - 0 phase and they are likely to do which of the following Your answer: a)fail to complete the S phase b) mutate during G1 phase c) repeat the cell cycle continuously d) die after completing mitosis
Answers
Answer:
c) repeat the cell cycle continuously
Explanation:
Cell division is a normal phenomenon for all cells as this is the way the cell reproduces and gets repaired in living organisms. However, some cells, due to mutation, keeps dividing and proliferating to form tumours. These cells are called CANCER cells. A normal cell undergoes cellular repair at certain checkpoints of the cell cycle. The checkpoints are necessary to determine a faulty cell and stop its division.
However, cancerous cells do not undergo any repair, which is why they do not enter the G0 phase as mentioned in the question. They keep on dividing out of control without death by repeating the cell cycle continuously.
How have speciation events led to great biodiversity?
Answers
Help meeeeee answer the question
Answers
Some of the trends include: disease, predator/prey relationships, habitat destruction and degradation, food availability, hunting pressure, and weather conditions. Deer populations are not static; they continuously change in response to many factors.
What is a disease?
In humans, the term "illness" is used to refer to a condition that results in suffering, dysfunction, social issues, or death for the person, as well as person similar to these for those who come into touch with the person. In this broader sense, it can also include isolated symptoms, deviant behaviours, disorders, syndromes, infections, atypical variations in structure and function, and injuries. However, in other contexts and for other purposes, these may be considered distinct categories. People can be influenced by diseases not just physically but also mentally, as acquiring and coping with a sickness can change a person's outlook on life.To know more about diseases, click the link given below:
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Cells have a charge across their membrane with the inner layer of the plasma membrane having a _________________ charge.
Answers
Cells have a charge across their membrane with the inner layer of the plasma membrane having a negative charge. This charge difference, called the membrane potential, is critical for several cellular functions, including the transmission of nerve impulses and the movement of ions and molecules in and out of cells. The membrane potential of cells is created by the movement of charged ions across the plasma membrane, which is selectively permeable and regulates the movement of molecules in and out of the cell.
The plasma membrane, also known as the cell membrane, is composed of a phospholipid bilayer with hydrophobic tails that face each other and hydrophilic heads that face the extracellular and intracellular environments. This structure creates a barrier between the inside and outside of the cell, allowing the cell to maintain an internal environment that is different from its surroundings.
The movement of charged ions across the plasma membrane creates a voltage difference between the inside and outside of the cell, resulting in a negative charge on the inner layer of the plasma membrane. The membrane potential of cells is maintained by several ion channels and transporters, which regulate the movement of ions in and out of the cell. This charge difference is critical for several cellular functions, including the transmission of nerve impulses and the movement of ions and molecules in and out of cells.
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[Step 1]: Determine from the data (Table 1) whether IGF2 is maternally or paternally imprinted (silenced).
A. Maternal B. Paternal
[Step 2]: In Cross Number 4, what is the expected number of heterozygous (IGF2/Δigf2 ) progeny?
A. 0 B. 12.5 C. 25 D. 37.5 E. 50
[Step 3]: To show that the functional allele is reversibly switched by the passage through the germline of the opposite sex, DeChiara et al. also made intercrosses between heterozygous F1 females and heterozygous F1 males. Based on your determination of how the IGF2 gene is imprinted, determine the expected phenotypic ratio of the progeny from these crosses (Normal : Growth deficient).
A. All Normal B. 3:1 C. 1:1 D. 1:3 E. 1:2:1 F. All dwarf
Answers
Specifically, we would expect to see a 3:1 ratio of normal to growth-deficient offspring, with normal offspring inheriting the silenced paternal allele and growth-deficient offspring inheriting the active maternal allele. Therefore, the answer is B. 3:1.
Based on the data in Table 1, IGF2 is paternally imprinted (silenced).
For Cross Number 4, the expected number of heterozygous (IGF2/Δigf2) progeny can be calculated using the formula:
Expected number of heterozygous progeny = 2 x (proportion of IGF2/Δigf2 offspring) x (total number of offspring)
From Table 1, we can see that the proportion of IGF2/Δigf2 offspring in Cross Number 4 is 0.5. The total number of offspring is 50.
Therefore, expected number of heterozygous progeny = 2 x 0.5 x 50 = 25
For the intercrosses between heterozygous F1 females and heterozygous F1 males, the expected phenotypic ratio of the progeny will depend on whether the functional allele is maternally or paternally imprinted.
Since we have determined that IGF2 is paternally imprinted, the expected phenotypic ratio of the progeny will be biased towards the paternal allele.
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