Question

Color blindness is a recessive trait. The gene for color blindness is on the X-
chromosome. The family tree below shows the trait of color blindness. The
only unknown is the father in the first generation.​

Answer 1

That would be D. He’s colorblind.

If the girls are going to be colorblind they need one allele from mother and one from their father. If the dad wasn’t colorblind none of the girls would be colorblind they’d just be carriers.

The cross is
XaY * XaXa
Which gives all colorblind males and females.

Answer 2

The given pedigree shows that all the daughters are homozygous for the recessive allele of colorblindness. It concludes that the father in the first generation is Colorblind. Thus, the correct option is D.

What is Pedigree Analysis?

Pedigree analysis may be defined as the study of the inheritance of genetic traits in several generations of a human family in the form of a family tree diagram.

The daughters by this disorder are only affected when the mother is either a carrier of a colorblind allele or possesses both the recessive allele and the father must have a colorblind allele.

The cross for satisfying the given condition is as follows:

$X^CY$ × $X^CX^C$.

Therefore, it is well described above.

To learn more about Colorblindness, refer to the link:

https://brainly.com/question/2094919

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