In a certain taxon of insects some have 17 chromosomes and the others have 18 chromosomes. The 17 and 18 chromosome-bearing organisms are

Options

A. males and frmales, respectively
B. femelses and males, respectively
C. all males
D. all frmales

Answer

A

Explanation

In certain insects, such as cockroach, and some roudworms, the Y-chromosome is missing so that the male has only one sex chromosome, i.e., 'X'. The condition in the male is XO (O means absence of one sex chromosome) and in the female it is XX., thus males showing 17 chromosomes while frmales show 18 chromosome. All the other option given are wrong.