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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?

Father’s Father
(brown hair)
Father’s Mother
(brown hair)
Bb Mother’s Father
(blond hair)
Father’s Mother
(brown hair)
BB
Father’s 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
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A BB brown hair B Bb brown hair bb blonde hair

1 answer

To determine the missing allele combinations for each person, we can summarize the information provided:

  1. Father’s Mother: Bb (brown hair)
  2. Mother’s Mother: BB (brown hair)
  3. Mother: Bb (brown hair)
  4. Child: bb (blond hair)

Now we need to identify the missing allele combinations for the Father and Father’s Father.

Since the mother is Bb and the child is bb, it can be inferred that the father must be bb, because the child received one b allele from each parent.

Let’s identify the allele combinations:

  • Mother’s Father (Blond hair): BB (as listed in the question)
  • Father: Bb (since the child is bb, and he must possess at least one b to contribute to the child)
  • Father’s Father: Bb (since he must contribute a B to the Father to keep the brown hair trait, but with a Bb combination)

Thus, here is the updated list:

  1. Mother’s Father: BB (blond hair)
  2. Father: Bb (brown hair)
  3. Father’s Father: Bb (brown hair)

Now fill in the missing combinations appropriately:

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