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. Birds have Z-W system. Male birds are ZZ whereas females are ZW. In chickens, barred feathers (ZB) are dominant over non-barred feathers (Zb). What is the probability of the offspring will be barred males if a barred male crossed with a non-barred female?
