One type of muscular dystrophy, Duchenne muscular dystrophy, is is an inherited condition that usually only affects boys. Muscle weakness is noticed as children begin to walk or run. Characteristic signs include walking on tiptoe and large calves. The disease occurs in one out of every 3000 newborn male children. Why is this disease limited to mostly boys?
Answers
Answer:
Explanation:
Duchenne muscular dystrophy acts as a X-linked recessive disease. Which means the gene sits on the X chromosome, and you need two bad copies to show disease (for females) and one bad copy (to show in males).
Now from our knowledge, we know males are XY and females are XX. Males have only one copy of the X chromosome from their mother and one copy of the Y chromosome from their father, thus if they get the mutated version of the gene that causes this disease, they will get the disease. However, if a female has a mutated version of gene on one of the X chromosome, the other X chromosome could have a normal gene and that normal gene would take over and produce a normal phenotype/function.
Since, boys only have one X chromosome, if they get the mutated gene they will get the disease, whereas females have two X chromosome (so even if one copy is bad and the other is good, the good version can take over, however boys don't have this) thus mostly male children are affected by this.
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Related Questions
Question:
Pepsin is an enzyme found in the human stomach that breaks down protein. Pepsin will not break down starch.
Which statement best explains this observation?
Answer: CORRECT (SELECTED)
Enzymes only work for specific substrates.
Explanation:
Each type of enzyme typically only reacts with one, or a couple, of substrates. Pepsin is an enzyme that acts only on proteins, which is why it does not affect starches (carbohydrates).
Answers
Pepsin is an enzyme found in the human stomach that breaks down protein and will not break down starch because enzymes only work for specific substrates.
What is an Enzyme?
This is defined as a biological catalyst which helps to speed the rate of chemical reaction in the body. They are also substrate specific which means they can't act on any type of substance.
Pepsin is an enzyme which breaks down protein substances which is therefore the reason why it won't act on other food substances such as carbohydrate etc.
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Answer:
Enzymes only work for specific substrates.
Explanation:
answer on khan
A single gene with two alleles control variation in haemoglobin type in sheep. There are three different phenotypes corresponding to genotypes S^AS^A S^AS^B and S^BS^B respectively in a flock of 175 sheep the frequency of allele S^A was found to be 0.6 and frequency of allele S^B WAS found to be 0.4
Answers
Populations in Hardy-Weinberg equilibrium express the same allelic and genotypic frequencies through generations. Number of individuals expressing each phenotype: 63 sheep S^AS^A, 84 sheep S^AS^B, 28 sheep S^BS^B.
What is Hardy-Weinberg equilibrium?The Hardy-Weinberg equilibrium theory states that allelic and genotypic frequencies in populations that is in equilibrium remain the same through generations. No evolutive forces are acting on these populations, so no evolution occurs.
Assuming a diallelic gene,
Allelic frequencies
The frequency of the dominant allele f(X) is pThe frequency of the recessive allele f(x) is qGenotypic frequencies
p² (Homozygous dominant genotypic frequency), 2pq (Heterozygous genotypic frequency), q² (Homozygous recessive genotypic frequency).The addition of the allelic frequencies equals 1
p + q = 1.
The sum of genotypic frequencies equals 1
p² + 2pq + q² = 1
In the exposed example,
Alleles Frequencies
S^A f(S^A) = p = 0.6S^B f(S^B) = p = 0.4Genotypes
S^AS^A ⇒ homozygousS^AS^B ⇒ heterozygousS^BS^B ⇒ homozygousWe need to get the number of animals expressing each genotype and phenotype. To do it, we just need to use allelic frequencies and calculate genotypic frequencies (p², 2pq, and q²), and then multiply these values by the total number of animals (N = 175).
Genotypic and Phenotypic frequencies
F(S^AS^A) = p² = 0.6² = 0.36
F(S^AS^B) = 2pq = 2 x 0.6 x 0.4 = 0.48
F(S^BS^B) = q² = 0.4² = 0.16
Number of individuals expressing each phenotype
S^AS^A ⇒ 0.36 x 175 = 63 individualsS^AS^B ⇒ 0.48 x 175 = 84 individualsS^BS^B ⇒ 0.16 x 175 = 28 individualsYou can learn more about the Hardy-Weinberg equilibrium at
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Complete question
A single gene with two alleles control variation in haemoglobin type in sheep. There are three different phenotypes corresponding to genotypes
S^AS^A S^AS^B and S^BS^BIn a flock of 175 sheep the frequency of allele S^A was found to be 0.6 and frequency of allele S^B WAS found to be 0.4.
Using the hardy weinberg equation calculate the number of sheep with each phenotypes in the flock show your working
D
4) This diagram shows a food chain from a desert ecosystem in Arizona. The arrows show
how the matter eaten by organisms moves through the food chain.
western
diamondback
rattlesnake
Select each organism below that is a primary consumer in this food chain.
brittlebush
pallid-winged
grasshopper
ubmit
brittlebush
grasshopper mouse
red-tailed hawk
grasshopper
mouse
pallid-winged
grasshopper
red-talled
hawk
western diamondback
rattlesnake
Question
answere
28
Time
elapsed
PAUSE
Challeng
Stage 3 of
Get 5 corred
in a row
Answers
The primary consumers in the food chain are the organisms that eat the producers, which in this case are the brittlebushes. The primary consumers are the pallid-winged grasshoppers.
The other organisms in the food chain are secondary consumers (grasshopper mouse), tertiary consumers (red-tailed hawk), and apex predators (western diamondback rattlesnake).
Here is a diagram of the food chain with the primary consumers highlighted in green:
brittlebush (producer)
----------------------->
pallid-winged grasshopper (primary consumer)
----------------------->
grasshopper mouse (secondary consumer)
----------------------->
red-tailed hawk (tertiary consumer)
----------------------->
western diamondback rattlesnake (apex predator)
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The conformational change in an enzyme after the substrate is bound that allows the chemical reaction to proceed, can be explained by
A.induced fit
B. transition
C. fit and fine
D. Pasteur
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Help plzzzzzzzzzzzzz will give brainliest
Answers
it's cytoplasm or mitochondria which ever one you feel is best
please help me figure this out
Answers
Giant sequoias can grow to be nearly 100 meters (328 feet) tall. They rely on a complex transport system to allow
water to travel from the roots to the leaves at the top of the tree.
Which transport tissue allows water to travel upward from the roots to the leaves?
Enter your answer in the box.
Answers
The transported tissue that allows water to travel upward from the roots to the leaves is the xylem tissue in vascular plants such as in this case giant sequoia.
What is the function of the xylem tissue in trees and vascular plants?The function of the xylem tissue in trees and vascular plants is to transport water and dissolved solutes from the roots to the upper organs, i.e., the shoot and leaves.
Therefore, with this data, we can see that function of the xylem tissue in trees and vascular plants is based on water transport.
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Which organism is likely to carry out the process shown in the diagram?
CO, + H,O
Heat
www
Chloroplast
Mitochondrion
MASS
Respiration
OA. Barn owl
OB. Mushroom
C. Alligator
-0₂
Sugar
ATP
Answers
Answer:
C
Explanation:
took the test
Part C
How would you change your model to show what happens when the other cell receives the protein?
Answers
To illustrate what happens when the other cell receives the protein, we can modify the model by introducing the concept of protein binding and cellular uptake.
Currently, the model focuses on the production and secretion of the protein by one cell. Here's how we can incorporate the process of protein uptake by another cell:
Model update: Add a receptor on the surface of the recipient cell. This receptor is specific to the protein being secreted by the donor cell. The receptor allows for binding and recognition of the protein.
Protein binding: Show the protein produced by the donor cell interacting with the receptor on the recipient cell's surface. This interaction represents the specific recognition and binding of the protein to its corresponding receptor.
Cellular uptake: Depict the internalization of the protein-receptor complex into the recipient cell. This step involves the engulfment of the protein-receptor complex by the recipient cell's membrane and subsequent transport into the cell's interior via endocytosis.
Intracellular processes: Highlight the intracellular trafficking of the protein within the recipient cell, such as transport to specific organelles or involvement in cellular processes. This step represents the utilization or processing of the protein within the recipient cell.
By incorporating these modifications into the model, we can visually represent the transfer of the protein from the donor cell to the recipient cell and showcase the subsequent cellular uptake and intracellular processes that occur upon receiving the protein.
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Which cloud builds and continues to grow? It often ends up stretching across all altitudes.
Answers
Answer:
Cumulus congestus cloud
Explanation:
Cumulus congestus cloud are created when a cumulus congestus cloud continues to grow higher into the atmosphere.
These clouds are enormous and stretch from a low base. They can occur alone or part of a line of clouds.
Some species of hummingbirds have different shapes of beaks that evolved to allow them to drink from certain flowers. The flower species have evolved to produce nectar that is tasty for the hummingbirds. This example is a type of . Cuckoos lay eggs in the nests of other birds. The cuckoo lays eggs identical to the eggs of the host species, so the other bird takes care of it. This is an example of .
Answers
When a flower species has evolved to produce nectar in response to the evolution of the beaks of hummingbirds to allow them to drink nectar, we say that coevolution has occurred.
The example of a bird taking care of the cuckoo's eggs where the cuckoo lays its eggs in the nest of the other bird is an example of parasitism.
Coevolution occurs in organisms which interact with one anotherIn most cases, one of the species relies on the other for survivalSo if one of the species undergoes a change, the other organism which relies on it also has to adapt and evolve to ensure its survivalIn a parasitic relationship, one organism which is the parasite harms the other organism to the hostIn parasitism, the parasite does not directly kill the hostLearn more about interspecific interactions here:
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What contributes to cell membrane fluidity? Proteins and lipids exist as separate but loosely attached molecules that can move around Protein enzymes create the fluidity. The cell is bathed in water. The transport of substances through the membrane makes it fluid.
Answers
Answer:
Proteins and lipids exist as separate but loosely attached molecules that can move around
Explanation:
Cell membranes are mainly composed of lipids, proteins, and also carbohydrates. Phospholipids are the most abundant type of lipid and the main constituent of the cell membranes. Membrane proteins are divided into two types according to their interactions with the cell membrane: 1-integral (intrinsic) and peripheral (extrinsic) proteins. These peripheral proteins are loosely attached by ionic bonds or calcium bridges with the phosphate heads of the phospholipids; whereas integral membrane proteins contain side chains that interact with fatty acyl groups of the phospholipids. Cell membrane fluidity indicates how easily lipids (e.g., phospholipids and cholesterol) and proteins (e.g., intrinsic proteins) diffuse laterally in the cell membrane. This fluidity is affected by the amount of cholesterol, temperature, and the ratio of unsaturated to saturated fatty acids. Saturated fatty acids have no double bonds in the hydrocarbon chain, whereas unsaturated fatty acids have at least one double bond (these double bonds increase fluidity). Moreover, higher temperatures increase membrane fluidity, whereas cholesterol molecules function to regulate membrane fluidity: at high temperatures cholesterol molecules stabilize the membrane, whereas at low temperatures intercalate between phospholipids, thereby preventing them from clustering together.
explain biological hotspot
Answers
A biodiversity hotspot is a natural ecosystems that are largely intact and where native species and communities associated with these ecosystems are well represented.
Answer:
A biodiversity hotspot is a biogeographic region with significant levels of biodiversity that is threatened by human habitation.
Explanation:
have a nice day.
Marcus's genotype for eye color is bb. Olivia has brown eyes, but she is heterozygous for the trait. What percent of the children have blue eyes? If Violet has green eyes and Jonas has brown eyes, what is Claudia's genotype? How many people in the family have blue eyes?
Answers
Explanation:
i hope it will help uuu..
observation my cat is a picky eater sometimes he would eat all his food sometimes he eats only half of it I do not want to keep spending money on different flavors of cat food I only buy one brand so I'm thinking it's the flavor. what flavor of cat food does my cat like the best?
Answers
Answer:
Umami.
Explanation:
Umami is the flavor which the cat like the most. This Umami flavor is present in the fish, shellfish, cured meats, meat extracts, mushrooms, vegetables. We know that fish is the most favourite food of cat and the main reason for this is the presence of Umami in the fish. So due to Umami flavor, the fish food is eaten by the cat with more enjoyment as compared to other foods so the person have to provide fish food to the cat for their good health.
How does the current affect plankton and nekton life?
Answers
Answer:
Advection by ocean currents modifies phytoplankton size structure at small scales (1–10 cm) by aggregating cells in different regions of the flow depending on their size. This effect is caused by the inertia of the cells relative to the displaced fluid
What is the cause and how to deal with strep throat,
Answers
Answer:
it he cause of spreading germs like bactria and infect sores on ur skin it take a while for them to realizes it uhm im not sure about how to cure/ deal with it
Explanation:
Carla was recently diagnosed with a brain tumour and has since completely lost
her appetite. The brain tumour is likely located in her:
dorsal hypothalamus
lateral hypothalamus
ventromedial hypothalamus
medial hypothalamus
Answers
Answer:
hypothalamus
Explanation:
Hunger is partly controlled by a part of your brain called the hypothalamus, your blood sugar (glucose) level, how empty your stomach and intestines are, and certain hormone levels in your body. Fullness is a feeling of being satisfied.
Which of the following is a nitrate?
A. NO3 -
B. NO2 -
C. NH3
D. N2
Answers
Answer:
A.) NO₃⁻
Explanation:
NO₃⁻ = nitrate
NO₂⁻ = nitrite
NH₃ = ammonia
N₂ = nitrogen (nitrogen naturally exists as a diatomic molecule)
When does the Northern Hemisphere receive the fewest direct rays from the Sun?
during the fall equinox
during the winter solstice
O during the spring equinox
during the summer solstice
0
Answers
Answer:
during the winter solstice is the correct answer
Explanation:
I took the test
During the winter solstice, the Northern Hemisphere receive the fewest direct rays from the Sun.
When does the Northern Hemisphere receive the fewest direct rays from the Sun?During the winter solstice, the sun's rays strike the Northern Hemisphere at the smallest angle which results in the fewest number of daylight hours in Northern Hemisphere.
So we can conclude that during the winter solstice, the Northern Hemisphere receive the fewest direct rays from the Sun.
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Question 7 of 10
Which of the following is the best hypothesis?
A Water is often warmer than air
B. More energy is needed to heat 100 g of water than to heat 100 g of
O C. How much energy do I need to heat 100 g of water from 20°C to
40°C?
O D. Water and Air would be a good name for a rock band,
Answers
Answer:
A and B sound like they are real answers
Explanation:
What would the complementary mRNA sequence be for the base sequence
on the DNA template shown here?
C-C-T-A-G-T-A-T-G
a. C-C-T-A - G-T-A-T-G
b. G-G-A-T-C-A-T-A-C
c. G-G-A-U-C-A-U-A-C
d. C-C-U-A -G-U-A-U-G
Answers
Answer:
(c) G-G-A-U-C-A-U-A-C
Drag each term to the correct location on the table. Each term can be used more than once.
What are the inputs and outputs of cellular respiration and photosynthesis?
water carbon
dioxide
sugar oxygen energy
Inputs
Outputs
Photosynthesis Cellular Respiration
Answers
The inputs of Photosynthesis are water and carbon dioxide and the outputs are sugar and oxygen.
The inputs of Cellular Respiration are Sugar and oxygen and the outputs are energy and carbon dioxide.
What are the inputs and outputs of respiration and photosynthesis ?Photosynthesis is a process that occurs in plants and some other organisms, where light energy is converted into chemical energy in the form of glucose (sugar) and oxygen is produced as a by-product.
On the other hand, cellular respiration is a metabolic process that occurs in all living cells and it converts the chemical energy stored in glucose (sugar) into usable energy in the form of ATP, while producing carbon dioxide as a waste product.
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A gardener is planting tomato plants. She buys two packs of seeds: Pack A and Pack B. She plants all the seeds and gives them the same amount of water, light, and fertilizer. After a few months, she measures the plants and notices that the plants grown from Pack B are shorter on average than plants grown from Pack A.
What could explain the difference in height between the plants from the two packs of seeds?
Answers
One possible explanation for the difference in height between the plants from Pack A and Pack B could be genetic variation between the two packs of seeds. It's possible that Pack A contains tomato plants with a genetic predisposition for taller growth, while Pack B contains plants with a genetic predisposition for shorter growth.
Another possible explanation could be differences in the soil quality or environmental conditions where the plants were grown, which could have affected their growth.
However, since the gardener gave the plants the same amount of water, light, and fertilizer, it seems less likely that environmental factors would be the sole cause of the difference in height.
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Write a 3-8 sentence paragraph as to how Sea urchins use Natural selection. 20 points and will mark the brainliest!
Answers
Answer:
Through the process of natural selection, sea urchins have developed spines that serve as a defense mechanism against predators and a means of anchoring themselves in turbulent waters. This adaptation allows them to better survive in their environment, with individuals possessing longer or stronger spines being more likely to pass on their genes to the next generation. As a result, the population of sea urchins gradually becomes better adapted to their surroundings, demonstrating the power of natural selection in shaping the evolution of species.
I need help putting these in order!
Answers
Based on the information provided, the order in which the events described took place is E, A, B, C, F, D.
How did Earth and life formation occur?In this sequence of events, Earth was formed first, this occurred as Earth cold down and therefore it became solid. Despite this, the existing atmosphere was different than the one we have now as it was rich in carbon dioxide, this led to oceans that were rich in the same component.
Due to this, the first life forms relied on carbon dioxide and release oxygen, which later led to an increase in the oxygen levels and different life forms.
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Present five incidences,as examples, where sports personalities'rights were violated.
Answers
Violation of privacy: Instances where sports personalities' personal information, such as private photos or videos, were leaked without their consent, infringing on their right to privacy.
Discrimination and harassment: Cases where sports personalities faced discrimination based on factors like race, gender, or sexual orientation, leading to unequal treatment or exclusion from opportunities.
Contract disputes: Instances where sports personalities' contractual rights were violated, such as unfair termination, breach of contract, or non-payment of agreed-upon fees.
Doping allegations and false accusations: Accusations of doping or performance-enhancing drug use without sufficient evidence, tarnishing the reputation and rights of the athletes.
Media intrusion and sensationalism: Invasion of privacy through aggressive media coverage, paparazzi harassment, or spreading false rumors, affecting the mental well-being and privacy rights of sports personalities.
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how did nepa revolutionize environmental protection in the united states
Answers
Answer: The National Environmental Policy Act (NEPA) was signed into law by President Nixon in 1970 and it revolutionized environmental protection in the United States by establishing a comprehensive national policy for the protection of the environment.
NEPA requires federal agencies to consider the environmental impacts of their actions and to provide an assessment of those impacts to the public. This process is known as an Environmental Impact Statement (EIS). The EIS requires agencies to analyze the environmental effects of proposed actions, alternatives to those actions, and the impacts of no action.
This act also established the Council on Environmental Quality (CEQ) to oversee the implementation of NEPA and to provide guidance to federal agencies on how to conduct the EIS process.
NEPA has played a critical role in protecting the environment by requiring federal agencies to consider the environmental impacts of their actions and to involve the public in decision-making. It has also helped to prevent or mitigate the negative impacts of federal actions on the environment.
The law also provided a framework for a robust public participation process in which citizens, organizations and tribes can raise concerns and provide input on proposed federal actions that may impact their environment.
In summary, NEPA revolutionized environmental protection in the United States by establishing a comprehensive national policy for the protection of the environment, requiring federal agencies to consider the environmental impacts of their actions, involving the public in decision-making and provided a framework for a robust public participation process.
Explanation: Hope this meets your requirement for your assignment! :DD
Describe an investigation using flashlights that are all the same?
Answers
One investigation using flashlights that are all the same is the Flashlight Investigation which is part of the Light and Shadow Workshop.
This workshop was developed using basic tools such as mirrors, lenses, and flashlights as the basis for explorations that can help build an intuitive understanding of how light works.
The activities are divided into five sessions, although the investigations can be extended well beyond this format. The first session, Flashlight Investigation is outlined here, the other sessions are outlined in separate Instructables.
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Is my response to this good is there anything I can change or add to make it better? You now know what an ecosystem is—and how varied ecosystems can be. Pick an ecosystem near you—find one that it as large or small as you wish. All areas—urban, suburban, and rural—have many ecosystems to choose from.Write a description of the ecosystem, including biotic and abiotic factors, in NO MORE THAN FOUR SENTENCES.An ecosystem close to me is a river. Abiotic factors: High water quality. The average water temperature is 55F. Biotic factors: There are many different types of fish, such as bull trout and salmon.
Answers
Answer
Abiotic factors: Here you can add how much sunlight can reach the water e.g moderate sunlight levels (If thats the case). You can also add if the water is clear or dirty.
Biotic factors: Most rivers also have frogs, include that, and some plants that grow in water.