<span>The mammalian sperm cell consists of a head, a midpiece and a tail. The head contains the nucleus with densely coiled chromatin fibres, surrounded anteriorly by an acrosome, which contains enzymes used for penetrating the female egg.</span>
heart, arteries, and veins
A mutation is one form of genetic variation.
Answer:
The answer is 25%.
Explanation:
Hemophilia is a recessive illness that is x-linked.
If the husband has normal clotting ability, that means he has the dominant gene since he has only one X chromosome.
Since there is a probability that their child will have hemophilia, this means that the woman, who has 2 X chromosomes but has normal blood clotting abilities, has one dominant and one recessive hemophilia gene.
The probability that their first child will be a male is 50% and the probability that he will have hemophilia is also 50% since he will only get the Y chromosome from the father and the mother has one dominant and one recessive.
So the probability that their first child will be a son with hemophilia is 25%.
I hope this answer helps.
Answer:
a. deterioration of neurons that produce the neurotransmitter acetylcholine.
Explanation:
Alzheimer's disease -
It is a disease associated with memory , it is a type of dementia .
The initial stages of the disease is the remember new things , the day to day task becomes very difficult with time .
During this disease the neurons get deteriorated day by day , which are responsible to produce the acetylcholine .
Hence , the correct statement about Alzheimer's disease is ( a ) .
