Question

Which of the following possess a homogametic male?

• A. All grasshoppers
• B. All humans
• C. All insects
• D. Many birds

Answer 1

The correct option is D Many birds

Establishment of male and female individuals by specific chromosomes is called chromosomal sex determination.
Different systems of chromosomal sex determination are as follows.
$\begin{array}{ccc}\text{XY system(Humans)}& \text{XX(Female)}& \text{XY(Male)}\\ \text{ZW system(Birds)}& \text{ZW(Female)}& \text{ZZ(Male)}\\ \text{XO system(Grasshopper)}& \text{XX(Female)}& \text{XO(Male)}\\ \text{Haploidiploid system(Honey bee)}& \text{Diploid(Female)}& \text{Haploid(Male)}\end{array}$
Here, we see that birds show female heterogamety and males are homogametic.