Question

Two parents with cleft chins, both heterozygous for cleft chin (Cc), have three children with cleft chins. The parents are sure that their fourth child will not have a cleft chin. Draw a Punnett Square to see if this is possible.
Determine the probability that the fourth child will have a cleft chin.


Using Models: What information does a Punnett square give? Does the Punnett square support the parents' prediction? Explain your answer.
Predicting: If these parents have a fifth child, what are the chances that the child will have a cleft chin? Explain your answer.

Answer 1

Question #74845 – Biology – Genetics

C – dominant allele, with cleft chin

c – recessive allele, without cleft chin

The Punnet square gives information about the possibility of any parents' signs to reveal in next generations.

According to the given the Punnet square, the probability that a child will not have a cleft chin is 25%. It means every fourth child may not have a cleft chin. That supports parents' prediction.

According to the Punnet square, the chances for fifth child to have a cleft chin are 75%.

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