blue eye colour is recessive to brown eye colour .A brown eyed man whose mother was blue eyed woman , marries with brown eyed woman whose father was blue eyed man . the children shall be
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
Both the parents for the present generations are heterozygous. So the F1 progeny would have the ratio of 3 brown eyes : 1 blue eyes.