hart shows allele combinations for brown/blonde hair: Father’s Mother, Bb; Mother’s Mother, BB; Mother, Bb; Child, bb. What allele combinations are missing?

Question

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

Answer 1

To identify the missing allele combinations based on the provided information, let's summarize what we know:

1. Father's Mother: Bb (brown hair)
2. Mother's Mother: BB (brown hair)
3. Mother: Bb (brown hair)
4. Child: bb (blonde hair)

Now, let's break down the remaining family members' genotype:

1. Father's Father: Since the Father has a Bb genotype, and the child's genotype is bb, the Father must have inherited a 'b' allele from his Father (male), meaning his Father must be Bb or BB. Given that the Father has brown hair, he can be either Bb or BB. Since a BB father cannot produce a bb child, this means Father's Father must be Bb.

2. Mother's Father: The Mother is Bb, and since she can also pass on a 'b' to her child (bb), it indicates that her Father must carry at least one 'b' allele. Since the Mother was also shown to have a BB genotype for her Mother, it means the Mother's Father must be bb.

Now, we can match each person with their respective allele combinations:

1. Mother’s Father: bb (blond hair)
2. Father: Bb (brown hair)
3. Father’s Father: Bb (brown hair)

So the final allele combinations are:

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