The recessive gene that always produces its effect is:

$A$: $XO$ type sex determination is found in a large number of insects.
$R$: Some of the sperms bear the $X$-chromosome,whereas some do not.

What are allosomes?

If a character is always transmitted directly from a father to all his sons and from their sons to all their sons,then which chromosome carries the gene for the character?

Monosomic male is a characteristic of which of the following?

An infant with $XX$ chromosomes results in a .........,whereas an infant with $XY$ chromosomes results in a ..........