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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Answer 1

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

Brief reasoning:
- Mother’s Father must be bb because Mother is Bb while Mother’s Mother is BB (the only way Mother gets a b is from her father).
- Child is bb and Mother is Bb, so Father must be Bb to contribute the other b allele.
- Given Father’s Mother is Bb and Father is Bb, the chart expects Father’s Father to be BB (so a Bb child can result from a Bb × BB cross).