A bent little finger is inherited with the autosomal dominant allele B . The aut

Question

A bent little finger is inherited with the autosomal dominant allele B. The autosomal recessive allele b codes for a straight little finger. Nan and her husband Nathan both have bent little fingers. Their first child, a son named Nicholas, has straight little fingers.

a. What is the probability that Nan and Nathan’s second child will have bent little fingers?

b. What is the probability that out of four children born to Nan and Nathan, 3 will have straight little fingers?

c. What is the probability that Nan and Nathan’s second child will have straight little fingers, their third child will have bent little fingers and their fourth child will have bent little fingers?

d. Out of three children born to Nan and Nathan, what is the probability that at least one will have bent little fingers?

Explanation / Answer

The genotypes of Nan and Nathan is Bb. They must be heterozygous. Then only their child can have straight fingers, which will be bb.

If we see the cross between Bb and Bb, the case if Nan and Nathan;

Since B is dominant so heterozygous will also have bent fingers.

A. If second child has bent littlr finger,

B. Out of four children, only one has the probabolity of straight fingers.

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