Which of the following is responsible for sex determination in chicks?

What type of sex determination is observed in grasshoppers?

In the buccal cavity slide cell of an individual, we observe a dark-stained body near the nuclear membrane. The genotype of the individual may be

What determines the sex of the embryo?

$A$ 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 $:1$)?

Organism with male heterogamety $- P$
Organism with female heterogamety $- Q$
$I -$ Human,$II -$ Bird,$III -$ Drosophila,$IV -$ Grasshopper
Select the correct option for $P$ and $Q$.
$\quad P \quad\quad Q$