In which of the following is the male monosomic $(XO)$?

$A$ $Y$-linked gene is responsible for hypertrichosis (long hair on ears). When an affected man marries a normal woman,what percentage of their daughters would be expected to have hairy ears (in $;\%$)?

The recessive gene that always produces its effect is:

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

$A$ man receives his $X$ chromosome from

What determines the sex of the embryo?