Question

In Drosophila the XXY constitution determines
A)Maleness
B)Femaleness
C)Intersex
D)Both A and C

Answer 1

Hint: Y- chromosomes don't play any role in Drosophila for the determination of sex. Drosophila Melanogaster is a small common fly in the family Drosophilidae. It is found near unripe and roasted fruit.

Complete answer:
-In Klinefelter syndrome males inherit one or more extra chromosomes. They inherited an extra X chromosome and their genotype became XXY. As a result,, they develop secondary sexual characters like high-pitched voice, asexual to feminine body,, and breast enlargement.
-In Drosophila, XXY leads to Femaleness because the Y chromosome doesn’t play any role in the determination of sex and has no contribution in Femaleness because sex is determined by a balance of female determinants X chromosome and Autosome A(male determinants).
-In the case of human beings males have XY chromosomes and females have XX chromosomes.So. Every individual has at least one X chromosome and in the Drosophila XXY constitution determines femaleness because Drosophila has only one X chromosome present and an increase in the number of X chromosomes leads to femaleness.

Additional Information: It is easy to determine males’’ drosophila flies from female drosophila flies. Males have sex combs in their first pair of legs.
-Drosophila Melanogaster exhibits complete metamorphosis which means their life cycle includes egg, larval form, pupa,, and finally into an adult fly.
Day 0 - eggs were laid by females.
Day1- eggs hatch
Day7-Larva begins roaming the stage and pupil formation occurs 120 hrs after egg laying.
Day11-12- Adults emerge from the pupa.
So, the correct answer is,” femaleness”.

Note: The sex in Drosophila is simply determined by the ratio of the number of X chromosomes to that of the number of sets of autosomes. The sex determination is achieved by a balance of female determinants on the X chromosome (X) and make determinants on the autosomes (A), the Y chromosome does not have a role in sex determination. This is known as the Genic balance theory.