Which follows the inheritance of color blindness in this family. The male I-2 is

Question

Which follows the inheritance of color blindness in this family. The male I-2 is affected with color blindness owing to an X-linked recessive mutation. Assume that the ONLY possible source of color blindness mutation/allele in the pedigree comes from I-2.

What is the probability that male IV-I is colorblind?

A) 1/4 B) 1/2 C) 1/6 D) 1/8 E) 1/16

Despite the odds, persons II-1 and II-2, now in their late 40's, are expecting another baby. What is the probability that this child will be born with normal vision? (hint: consider that the child can be a boy or a girl)

A) 1/4 B) 1/2 C) 2/3 D) 3/4 E)1

Likewise, if persons II-4 and II-5 were to have another child, what is the probability that they would have a child with normal vision? (hint: consider that the child can be a boy or girl)

A) 1/4 B) 1/2 C) 2/3 D) 3/4 E) 1 (100%)

Explanation / Answer

choose:

1) C

2) D

3) D

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