<span>The major structure that supplies the cells with nutrients and removes their waste is the circulatory system. The circulatory system is composed of the heart, the blood vessels going from and back to the heart, and the blood that travels inside them. The blood vessels that carry nutrient and oxygen-rich blood to the cells are arteries. They become the thinner arterioles, and then the thinnest capillaries. With the exception of the pulmonary arteries, which carry non-oxygenated blood from the heart to the lungs, all arteries carry oxygenated blood. The capillaries disburse the nutrients and oxygen to the cells and pick up wastes and carbon dioxide, form into the thicker venules, then to form veins, which lead back to the heart (with the exception of the pulmonary veins, which carry oxygenated blood from the lungs to the heart). Veins also differ from arteries in that veins have valves to prevent blood from flowing backward.</span>
1. Is the child is born male then the then the probability is 50%, and if female then the child will be normal provided father is normal.
2. Probability of me receiving the affected gene is 50%.
3. If the mother is normal then 0% chance that the child will receive mutated allele in his genome.
<h3><u>Explanation:</u></h3>
Duchenne muscular dystrophy is sex linked recessive disease which is seen as hereditary disease. This disease has a mutated gene which is present on the X chromosome. It produces proteins that results in muscular dystrophy.
A. As the mother's brother is affected with the disease so we can assume that the mother is a carrier of this disease. Hence one of the X chromosomes of mother is affected. If the child is female then 1 X chromosome will be received from father and other one from mother. So if the father is normal then even if the child receives mutated X chromosome from mother then also she will be normal. So a female child want to be a diseased one if the father is normal. If the child is male then and there is a 50% chance that the X chromosome he is receiving from mother is the mutated one. Show the chance of child being diseased is 50%.
B. As the mother's brother is deceased then the mother is taken to be a carrier. Hence one of the X chromosomes of mother is mutated and other one is normal. Hence the chance of receiving the mutated allele from mother is becomes 50%.
C. As the father's brother is having disease but father is not having the disease then fathers X chromosome must be normal because if the mutated allele was present then father would have been diseased as well. Hence is the mother is normal then the chance of the child being diseased becomes 0% .
Answer:
I am going to say answer D but plz forgive me if i am wrong
Explanation:
Retina is the area at the back of eye where image is formed and it is the layer of photoreceptors and other neurons.neurons transmit this image to brain.
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