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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?

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.

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Mother’s Father
Father
Father’s Father
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1 answer

To determine the allele combinations for the missing persons in the chart, we need to understand the inheritance pattern for the hair color trait based on the given information.

  1. Father’s Mother (Bb): This individual can either pass on a B (brown) or a b (blonde) allele.
  2. Mother’s Mother (BB): This individual can only pass on a B (brown) allele since they are homozygous.
  3. Mother (Bb): Similar to the Father's mother, she can pass on a B (brown) or b (blonde).
  4. Child (bb): This child can only have received b alleles from both parents, meaning both parents must carry at least one b allele.

Now, we tackle the remaining individuals.

  • Father’s Father: Since the father has a brown hair genotype (Bb or BB) and one of the alleles must be compatible with the bb combination of the child, we conclude he must be Bb (since BB would not produce a bb child).

  • Mother’s Father: The mother’s father must provide a genotype that includes a B, as he can only pass down the B allele (from the mother’s mother being BB). Therefore, the mother's father must be BB.

  • Father: The father, who has brown hair, can thus be Bb. He has inherited one Brown allele from either parent, and thus can pass either a B or b allele.

Final allele combinations:

  • Mother’s Father: BB
  • Father: Bb
  • Father’s Father: Bb

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