Assume that attached earlobes is an autosomal recessive trait with 47% penetrance. If one parent is heterozygous (Aa) and the other homozygous recessive (aa) for the attached earlobe gene, what is the probability that their first child will have attached earlobes? Show calculations please!  a. 50% b. 11.75% c. 25% d. 23.5% e. 74%

Human Anatomy & Physiology (11th Edition)
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ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
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Assume that attached earlobes is an autosomal recessive trait with 47% penetrance. If one parent is heterozygous (Aa) and the other homozygous recessive (aa) for the attached earlobe gene, what is the probability that their first child will have attached earlobes? Show calculations please! 

a. 50%
b. 11.75%
c. 25%
d. 23.5%
e. 74%

Expert Solution
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The Punnett Square is a method for predicting the genotypes of an offspring's prospective offspring and their likelihood of occurring. The alleles of the parents are simply crossed together on a Punnett square, and the resulting crossings are the genotypes of the children. A person's genotype is the set of alleles that they inherit from their parents.

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