Question

A hammerhead shark that gave birth in a Nebraska aquarium reproduced without mating, ….Instead, the female shark’s own genetic material combined during the process of cell division that produces an egg. A cell called the secondary oocyte, which contains half the female chromosomes and normally becomes the egg, fused with another cell called the secondary polar body…. Assume that the female shark was heterozygous at a particular gene A. The article above says that a secondary oocyte fused with a polar body. Let us assume that it is derived from the first polar body. What are the possible genotypes of the zygote and why?

Answer 1

so their is possibly 2 gamates is formed as

(A or a) from sec.oocyte

And (A or a) from polar body and

Cross of gamete A and a can produced

Four zygote as ::::- AA,,Aa,, and aa in

1:2:1 in order