a cleft chin is a dominant trait. one parent is heterozygous for cleft chin, and the other parent does not…

a cleft chin is a dominant trait. one parent is heterozygous for cleft chin, and the other parent does not have a cleft chin. what is the probability that the offspring will have a cleft chin? 1 out of 4 2 out of 4 3 out of 4 4 out of 4

a cleft chin is a dominant trait. one parent is heterozygous for cleft chin, and the other parent does not have a cleft chin. what is the probability that the offspring will have a cleft chin? 1 out of 4 2 out of 4 3 out of 4 4 out of 4

Answer

Explanation:

Step1: Define alleles

Let (C) represent the dominant allele for cleft - chin and (c) represent the recessive allele. The heterozygous parent has the genotype (Cc) and the non - cleft chin parent has the genotype (cc).

Step2: Set up Punnett square

The possible gametes from the (Cc) parent are (C) and (c), and the possible gametes from the (cc) parent are (c) and (c). The Punnett square combinations are: (Cc), (cc), (Cc), (cc).

Step3: Calculate probability

Out of the 4 possible genotypes of the offspring ((Cc), (cc), (Cc), (cc)), 2 have the dominant allele (C) (which results in a cleft chin). So the probability of having a cleft chin is (\frac{2}{4}).

Answer:

2 out of 4