3. In fruit flies, humans and other mammals, sex is determined by an X-Y system. However, many organisms do not have the X-Y system of sex determination. For example, birds have a Z-W system. Male birds are ZZ, whereas females are ZW. In chickens, barred feathers (Z) are dominant over nonbarred feathers (Zb). a. Draw a Punnett square that shows the results of a cross between a barred female and a nonbarred male.
paglagyan ng genotypic radio and phenotypic radio.pasagot po plss.​​