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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.

(1 point)
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Mother’s Father
Father
Father’s Father

1 answer

To fill in the missing allele combinations for the individuals in the chart based on the provided information, let's break down the known information:

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

Based on the known traits and allele combinations, we can derive the following:

  1. Mother’s Father: Since the mother is Bb (from a BB mother and Bb, which means her father must be the only source of the recessive 'b'), her father must be Bb (brown hair, but can pass on a 'b' allele).
  2. Father: The father has brown hair and can pass either B or b alleles to the child. Given that the child is bb, the father must also be Bb.
  3. Father’s Father: Since the father has brown hair and can either be BB or Bb, and since the father is Bb, his father (Father’s Father) must be BB (since he can’t pass on a 'b' allele).

Now we can fill the inputs correctly as follows:

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

This matches the combinations ensuring the family genetics remain consistent with the traits provided.