$ZW-ZZ$ type of sex determination is seen in . . . . . . .

$A$ diseased man marries a normal woman. They get three daughters and five sons. All the daughters were diseased and sons were normal. The gene of this disease is

From the chromosomal complements given below,identify the one which shows female heterogamety.

What is the number of chromosomes in a sterile female worker bee in a beehive?

Male heterogamety is a characteristic of which of the following?

Sex-linked characters have one distinct feature: