In terms of chromosomes,females produce $.......$ type of ova,while males produce $.......$ types of sperms.

Barr body in mammals represents

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 $Q$.
$\quad P \quad\quad Q$

If a gene for a recessive trait is present in a single copy in an individual and still expresses itself,what could that individual be?

$A$ 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 presence of hair on the pinna of the ear in males is known as what?