Question

Pick out the correct statement.

• A. XO type of sex chromosome determines male sex in grasshoppers
• B. The Y chromosome in XX-XY system has no role in sex determination
• C. Homozygous sex chromosome (ZZ) determines female sex in birds
• D. Homozygous sex chromosome(XX) produce male in Drosophila

Answer 1

The correct option is A XO type of sex chromosome determines male sex in grasshoppers

In the chromosomal basis of sex determination, the presence or absence of a particular chromosome determines the sex of an individual organism.
There are four different types of sex-determining mechanism that exists in animals that is XY, ZW, XO, and haplodiploid system.

Following are the different systems of sex determination.
$$\begin{array}{ccc}\text{XX-XY system(Humans)}& \text{XX(Female)}& \text{XY(Male)}\\ \text{ZZ-ZW system(Birds)}& \text{ZW(Female)}& \text{ZZ(Male)}\\ \text{XX-XO system(Grasshopper)}& \text{XX(Female)}& \text{XO(Male)}\\ \text{Haploidiploid system(Honey bee)}& \text{Diploid(Female)}& \text{Haploid(Male)}\end{array}$$\)