Sex-linked characters are:

$A$ family has five girls and no boys. What is the probability of having a boy as the sixth child?

In Melandrium,the sex determination type is:

In humans,the chromosomal condition of a male is:

In $Bonellia$,all larvae are genetically and cellularly identical. The male individual lives in the uterus of the female. If a larva settles near the proboscis of an adult female,it develops into a male. If the larva develops freely in the water,it develops into a.....

Genes located on the $Y$ chromosome in males are called ........