A brown-eyed man, whose father had blue eyes and whose mother was brown, married a brown-eyed

A brown-eyed man, whose father had blue eyes and whose mother was brown, married a brown-eyed woman whose parents had brown eyes. what offspring can be expected from this marriage?

The sign of brown-eyed is dominant, let us designate it A. Blue eye color is a recessive sign (a). Based on the color of the parents’ eyes, the man will have the Aa genotype. If a woman has both brown-eyed parents, then most likely her genotype will be AA (although it may be Aa).
Option I.
Parents AA X Aa
Gametes A, A and A, a
Offspring 2 AA (brown ch.), 2 Aa (brown ch.).
All children are brown-eyed.
Option II.
Parents Aa X Aa
Gametes A, a and A, a
The offspring of AA, Aa, aA, aa.
In this case, the ratio of brown-eyed children to blue-eyed children is 3: 1.



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