What are allosomes?

$A$ gene located on the $Y$-chromosome is inherited from father to son; this is known as:

There are five daughters and no son in a family. It may be due to

Usually,the recessive character is expressed only when present in a double recessive condition. However,a single recessive gene can express itself in human beings when the gene is present on

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