In which of the following organisms is the structure $Male \rightarrow n$ and $Female \rightarrow 2n$ observed?

If a couple has $5$ daughters,what is the probability that the $6$th child will be a boy?

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

$A$ fruit fly is heterozygous for sex-linked genes and is mated with a normal female fruit fly. In what proportion will the male-specific chromosomes enter the egg cells (in $:1$)?

The person who discovered $Y$ chromosomes was

How is sex determined in various organisms? Give the historical background of sex determination.