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
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1 answer

Based on the information provided about the allele combinations involved in determining hair color, we can match the individuals accordingly:

  1. Father’s Father: Since the father has brown hair but contributes to a child with blonde hair (bb), we can deduce that he must have a 'B' (brown hair) and a 'b' (blonde hair) allele. Therefore, the combination is Bb (heterozygous brown).

  2. Father: The father has brown hair, and since his mother is Bb and the child's genotype is bb, he must have the allele combination Bb.

  3. Mother’s Father: The mother’s father has blonde hair. Since his daughter (the mother) has the combination Bb and needed to contribute a b to the child, his allele combination must be bb (homozygous blonde).

Here is the final matching:

  • Mother’s Father: bb
  • Father: Bb
  • Father’s Father: Bb

Feel free to adjust the placements you need based on this information!

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