Principles of Inheritance and Variation Question 210

210. Blue eye colour is recessive to brown eye colour. A brown eyed man whose mother was blue eyed marries a blue-eyed woman. The children shall be

[1991]

(a) both blue eyed and brown eyed $1: 1$

(b) all brown eyed

(c) all blue eyed

(d) blue eyed and brown eyed $3: 1$

Show Answer

Answer : a

Hints & Solution

(a) The brown eyed man will have the genotype $Bb$ and his wife $bb$. Hence $Bb \times bb=$ $Bb: bb$. Hence ratio is $1: 1$.