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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)
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 .

1 answer

To fill in the missing allele combinations based on the information provided in the chart, we can deduce the following:

  1. Father’s Father - Since the Father’s Father is not directly given but we know he must contribute to the Father’s alleles and the Father’s Mother is Bb (brown hair), the Father’s Father must be either BB (homozygous brown) or Bb (heterozygous brown). Since at least one child (the Father) does have a brown hair allele (B), it is likely he is Bb. Hence, Father's Father: Bb or BB.

  2. Mother’s Father - The Mother’s Father is stated to have blond hair. Thus, his genotype, which determines the hair color, must be bb (since blond is typically associated with the recessive allele in this scenario).

  3. Father - The Father's genotype must be either Bb or BB due to the combination of the alleles from his parents. Since the Father's Mother is Bb, and both parents give one allele to the child, the most plausible allele combination for the Father is Bb.

Summarizing the combinations:

  • Mother’s Father = bb (blond hair)
  • Father = Bb (brown hair)
  • Father’s Father = Bb or BB (brown hair)

With this information, the missing allele combinations are:

  1. Mother’s Father: bb
  2. Father’s Father: Bb (or BB depending on interpretation)
  3. Father: Bb

So the answers are:

Mother’s Father: bb Father: Bb Father’s Father: Bb (or BB)