Q8: the chromosome that carries the fewest number of genes in
humans is the y chromosome. the y chromosome carries only
about 344 genes. some of the dna in the y chromosome has no
genes in it. out of all the genes within a cell, what percentage of
them are on the y chromosome?

the father in the first generation probably had the recessive colorblind trait in his x chromosome. if he and his wife both had the colorblind trait, even if she had 1 recessive and 1 dominant, then that trait would be passed on to their kids.

(since you didn't attach the family tree this is just an assumption)

is this for the e2020 class

thrombocytopenia, which is a deficiency in blood platelets, can cause bleeding and bruising in the dermis similar to senile purpura. other possible causes include: exposure to ultraviolet rays and aging skin are common causes of senile purpura. senile purpura may also be a sign of collagen loss in the skin and bones.