Question

Pooja has green eyes while her parents and brother have black eyes. Pooja’s husband Ravi has black eyes while his mother has green eyes and father has black eyes.

a. On the basis of the above given information, is the green eye colour a dominant or recessive trait? Justify your answer

b. What is the possible genetic makeup of Pooja’s brother’s eye colour?

c. What is the probability that the offspring of Pooja and Ravi will have green eyes? Also, show the inheritance of eye colour in the offspring with the help of a suitable cross.

OR

c. 50% of the offspring of Pooja’s brother are green eyed. With help of cross show how this is possible.

Answer 1

(a) Yes, green eye colour is recessive as it will express only in homozygous condition.

(b) BB, Bb

(c) bb*Bb

	B	b
b	Bb	bb
b	Bb	bb

Genetic cross - 50% of the offsprings can have green eye colour.

OR

(c) Brother is heterozygous (Bb) and wife is green (bb)

Wife bb*Bb brother

	B	b
b	Bb	bb
b	Bb	bb

50% of the offsprings can have green eye colour as per the cross shown.