In human, blue eyes are recessive to brown eyes. If a boy h…

Biology Principles of Inheritance and Variation Skill Builder Single Correct MCQ

Published on: August 21, 2026

In human, blue eyes are recessive to brown eyes. If a boy has brown eyes and his mother and sister has blue eyes then what will be genotype and phenotype of his father?

Genotype - Bb Phenotype-Brown eyes

Genotype-BB Phenotype - Brown eyes
and

Genotype - bb Phenotype - blue eyes

Both

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The correct answer is:

Let us suppose BB are the alleles for brown eye and bb are the alleles for blue eyes.
The genotype of boy must be BB or Bb , his mother and sister must be bb. For brown eye children, the father must be heterozygous dominant.

Parents: Mother Father

bb Bb

(blue eye) (brown eye)

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