Modeling Sexual Reproduction Quick Check

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Question
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
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Answer 1

To determine the missing allele combinations for each of the individuals based on the provided chart regarding hair color (where B = brown hair and b = blonde hair), we need to match the parents and their respective alleles.

From the information you provided:

• Father’s Mother = Bb (brown hair)
• Mother’s Mother = BB (brown hair)
• Mother = Bb (brown hair)
• Child = bb (blonde hair)

Since the child has a genotype of bb (blonde hair), both parents (the father and mother of the child) must contribute a "b" allele.

Let’s decode each person:

1. Mother’s Father:

   • Since the mother (Bb) and the mother’s mother (BB) are both brown-haired, the mother must have inherited one "B" from her mother (BB) and one "b" from her father. Thus, the mother's father must be Bb (brown hair).

2. Father:

   • The father must have at least one "b" allele to have a child with a genotype of bb. Therefore, he must be Bb (brown hair) as well.

3. Father’s Father:

   • The father’s father must produce a brown-haired offspring (father), so he can either be BB or Bb. Since we already determined the father is Bb, it’s clear the father’s father can also be BB or Bb. However, typically in this kind of problem, father's father is often BB to maintain a consistent paternal contribution of brown hair in the family lineage. Thus, we will assume he is BB.

So, the matched combinations are:

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

Please match the responses in your chart accordingly.

Answer 2

is that correct cs bb is the only question left

Answer 3

To clarify and summarize the allele combinations based on the context you've provided:

• Child = bb (blonde hair): This means both parents must contribute a "b" allele, since the phenotype is blonde, represented by "bb."

• Mother: We know the mother is Bb (since she has brown hair and can contribute a "b" to the child).

• Mother’s Mother: She is BB (since she has brown hair).

• Mother’s Father: Since the mother is Bb, and her mother is BB, the most logical allele for the mother’s father would be Bb (one brown allele from the mother, one blonde allele from the father).

• Father: Since the child is bb, the father must be Bb (since he contributes one "b" to the child).

• Father’s Father: Typically, to keep the consistency of the phenotype (brown hair) down the line, the father’s father can also be BB or Bb. Since we did not receive explicit information on his phenotype, we can infer he might be either, but to keep it simple, we will assume he is BB.

With this information, the completed allele combinations are:

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

So, the answer to your question regarding "bb being the only question left" relates to the child. The allele combinations you provided were matched appropriately:

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

If your chart requires you to acknowledge that bb is the genotype for the child resulting from these combinations, that is correct. It indicates who contributed the necessary alleles resulting in the child having blonde hair.

If you have any further questions or need clarification on this context or any genetic combinations, feel free to ask!