Answer :
There is a 25% of chance for expressing the recessive trait (3:1 phenotypic proportion).
What is a Punnett square?
A Punnett square is a diagram used to represent gametic combinations for one or more gene loci.
- In this case, the child will exhibit normal earlobes but he is heterozygous carrying the recessive allele.
The Punnet square is:
E e
E 1/4 EE 1/4 Ee
e 1/4 Ee 1/4 ee
In conclusion, there is a 25% of chance for expressing the recessive trait (3:1 phenotypic proportion).
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