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Match each person with the correct allele combination.



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Notice that the child’s mother carries an allele for blonde hair (b), even though the child’s mother’s mother does not. What does this mean for the child’s mother’s father? What allele must he have?
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Mother’s Father
Father
Father’s Father

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To determine the allele combinations for each person, let's analyze the given information regarding the child and their family.

Key Allele Notations:

  • Let “B” represent the dominant allele for dark hair (which the child’s mother likely possesses) and “b” represent the recessive allele for blonde hair.

Information Given:

  • The child’s mother carries an allele for blonde hair (b).
  • The child’s mother’s mother does not carry the allele for blonde hair (which implies she is likely homozygous for the dominant allele, BB).
  • Therefore, the mother’s mother (the child’s grandmother) must be BB, and since the mother has a blonde hair allele (b), her father (the child’s grandfather) must carry one allele for blonde hair (b) for the mother to have inherited it.

Conclusion:

  1. Mother’s Father (Child’s Grandfather): Must have the allele combination Bb (one blonde hair allele and one dark hair allele).
  2. Father: The child's father doesn't have specific information given, but he could potentially be BB or Bb.
  3. Father’s Father (Child’s paternal grandfather): Also, no information is given; could potentially be BB or Bb.

Given the relationships described and that the mother must have received the blonde allele from her father, the responses would be:

  • Mother’s Father: Bb
  • Father: (Not enough information to conclude)
  • Father’s Father: (Not enough information to conclude)

If needed to provide response combinations, they would look something like this based on common understanding of inheritance.