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?

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
BB brown hair
Bb brown hair
bb blonde hair

Answer 1

To fill in the missing allele combinations, let's first understand the allele designations:

• B = allele for brown hair
• b = allele for blonde hair

Given the following information and combinations:

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, we can find a suitable allele combination for the missing individuals:

• Father’s Father: Since the child has blonde hair (bb), and the mother is Bb, the father must have at least one "b" allele. Since we know his mother (Father’s Mother) is Bb, he must be Bb to provide that "b" allele to the child. Thus, he can be either Bb (brown hair).

• Mother’s Father: Mother's mother is BB (brown hair), and the mother is Bb, meaning the mother's father must also be BB since he can only pass on a "B" allele.

So the missing combinations are:

• Mother’s Father → BB (brown hair)
• Father → Bb (brown hair)
• Father’s Father → Bb (brown hair)

Putting it all together:

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

Here’s the filled out answer for your reference:

• Mother’s Father: BB brown hair
• Father: Bb brown hair
• Father’s Father: Bb brown hair
• Child: bb blonde hair