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?

Question

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

Answer 1

To identify the missing allele combinations, let's analyze the given information:

• Father’s Mother: Bb (brown hair)
• Mother’s Mother: BB (brown hair)
• Mother: Bb (brown hair)
• Child: bb (blond hair)

Based on the information:

1. The child (bb) must inherit one b allele from each parent to have blonde hair.
2. The father's allele combination is unknown, but he must contribute a b allele to the child.

Now we need to find allele combinations for the father and the father's father.

• Father: Since the child has a bb genotype, and the mother is Bb, the father must be Bb (heterozygous brown) to provide one b allele.

• Father’s Father: He must be homozygous brown (since he has brown hair) and can either be BB or Bb. Since the father is Bb, we can assume that the father's father must be BB (homozygous for brown hair).

Now, let's summarize:

• Mother’s Father: The mother’s father has brown hair, which can be either BB or Bb. Since the mother is Bb and has a brown phenotype, he must be BB.

• Father: The father must be Bb to provide a b allele.

• Father’s Father: Since he has brown hair, he must be BB.

So the correct allele combinations would be:

1. Mother’s Father: BB
2. Father: Bb
3. Father’s Father: BB

You can fill those responses accordingly in your chart.