An allele carried on a y chromosome will affect
a. all of the female offspring.
b. some of the male and female offspring.
c. all of the male offspring.
d. none of the offspring.

the cell cycle is the final answer! : )

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.