Question

A chart shows allele combinations for brown/blonde hair: Father’s Mother, Bb; Mother’s Mother, BB; Mother, Bb; Child, bb. What allele combinations are missing?

Genetic Inheritance of Eye Color Through Generations
Father’s Father
(brown hair) Father’s Mother
(brown hair)
Bb Mother’s Father
(blond hair) Mother's Mother
(brown hair)
BB
Father
(brown hair) Mother
(brown hair)
Bb
Child
(blond hair)
bb
Match each person with the correct allele combination.

(1 point)
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Mother’s Father
Father
Father’s Father

Answer 1

Mother’s Father = bb
Father = Bb
Father’s Father = BB

Why: The child is bb, so each parent gave a b; the mother is Bb so the father must be Bb. The mother’s father must be bb (he gave the b while the mother’s mother is BB). The only remaining genotype for Father’s Father is BB.