The Barr body is observed in

Distinguish between: Sex determination in humans and Sex determination in Drosophila.

The theory where the ratio between the number of $X$-chromosomes and the number of complete sets of autosomes determines the sex is known as:

What is the number of chromosomes in a sterile female worker bee in a beehive?

Which of the following best explains the formation and cellular basis of gynandromorphs in $Drosophila$?

In $Drosophila$,the $XXY$ condition results in a female,whereas in humans,the same condition results in a male with $Klinefelter's$ syndrome. This proves that: