A husband and wife both have cleft chins, and when you look at their four children, three also have cleft chins; however, one does not. What can you deduce from this observation, if you already know the cleft phenotype is due to two alleles of the same gene?
(A) A cleft chin is an example of a recessive trait.
(B) A cleft chin is due to a dominant allele.
(C) This pattern of inheritance in the children must result from both parents being homozygous for the same allele.
*D) All four children are heterozygous for the two different cleft chin alleles
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