Concept explainers
a.
To list: The genotypes of the family members.
Introduction: The dominant characters in the genotypes are represented by “PP”. Recessive characters are represented by letter “pp”. However, the heterozygous characters are represented by the “Pp”. The outsiders are also considered healthy and dominant and unknown genotypes are represented by P.
b.
To determine: The probability of the first child to have the PKU, when person A and B marry.
Introduction: Phenylketonuria is an autosomal recessive condition which is caused due to alteration of metabolic amino acid. The
c.
To determine: The probability of the second child to be unaffected when first child is diseased.
Introduction: Generally, a child to be diseased requires both the parents to be factor causing the disease. It is not necessary that parents will exhibit the signs, but without showing signs, parents can transmit the disease to progenies. The parents of the children can either be diseased or carrier.

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Chapter 2 Solutions
ACHIEVE:INTRO TO GENETIC ANALYSIS 1TERM
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