Red-green color blindness is due to an x-linked recessive allele in humans. a widow’s peak (a hairline that comes to a peak in the middle of the forehead) is due to an autosomal dominant allele. consider the following family history: a man with a widow’s peak and normal color vision marries a color-blind woman with a straight hairline. the man’s father had a straight hairline, as did both of the woman’s parents. use the family history to make predictions about the couple’s children. what is the chance that any daughter the couple has will be color blind with a straight hairline?
what is the chance that any son that the couple has will be color blind with a widow's peak?
if the couple has a child, what is the chance that it will be a daughter with a widow's peak?
suppose the couple had a daughter with normal color vision and a widow's peak. what is the chance that she is homozygous for both genes?
01/23/411/4

1. The possibility of that couple having a daughter with color blindness and a straight hairline is

2. The possibility of that couple having a son with color blindness and a widow's peak is

3. The possibility of that couple having a daughter with a widow's peak is

4. Suppose the couple had a daughter with normal color vision and a widow's peak. The The possibility of that she is homozygous for both genes is

Explanation:

A widow’s peak (a hairline that comes to a peak in the middle of the forehead) is due to an autosomal dominant allele.

B: dominant allele (having a widow's peak)

b: recessive allele (having a straight hairline)

=> BB and Bb genotypes have a widow's peak, while bb genotype has a straight hairline.

Red-green color blindness is due to an X-linked recessive allele in humans.

: recessive allele (color blindness)

: dominant allele (normal color vision)

>>> A man with a widow’s peak and normal color vision (husband) has the genotype: B _ Y.

The husband's father had a straight hairline (bb genotype).

Therefore, the genotype of the husband is BbY.

>>> The wife has a straight hairline and is color blinded.

Therefore, she has bb genotype.

Please see the image attached here (Punnett square) for the genotypes of their children. The image shows that there are four genotypes of children.

1. The possibility of that couple having a daughter with color blindness and a straight hairline (bbX^{a}[/tex]) is 25%.

2. The possibility of that couple having a son with color blindness and a widow's peak (Bb Y) is 25%.

3. The possibility of that couple having a daughter with a widow's peak (B_) is 25%.

4. Suppose the couple had a daughter with normal color vision and a widow's peak (B__). The The possibility of that she is homozygous for both genes is 0%.

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