There is a gene in humans that causes dimples to form on the face. The allele th

Question

There is a gene in humans that causes dimples to form on the face. The allele that causes facial dimples (D) is completely dominant to the allele (d) that does not cause dimples. Let’s say there is a man and woman who are both heterozygous at this locus. The predicted phenotypic ratio of their F1 is: a. 1:1 b. 1:2 c. 1:2:1 d. 3:1

There is a gene in humans that causes dimples to form on the face. The allele that causes facial dimples (D) is completely dominant to the allele (d) that does not cause dimples. Let’s say there is a man and woman who are both heterozygous at this locus. What is the probability that their first child will have dimples? a. 25% b. 50% c. 75% d. 100%

There is a gene in humans that causes dimples to form on the face. The allele that causes facial dimples (D) is completely dominant to the allele (d) that does not cause dimples. Let’s say there is a man and woman who are both heterozygous at this locus. What is the probability that their second child will have dimples? a. 25% b. 50% c. 75% d. 100%

Explanation / Answer

* Punnett square can used to find solutions based on the above information.Both male and female

are heterozygous and having alleles of facial dimples(D) dominant to the allele(d) that does not cause

dimples.

    Accourding to punnett square

Male(Dd) ,Female(Dd) (Each box represent 25% )

* The predicted phenotypic ratio of their F1 is 3:1.(DD,Dd,Dd):(dd).

* Probability of first child will have dimples is 75%.

* Probability of second child will have dimples is 75%.( Nature of first child and second child are

seperate events in both cases probability is same.)

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