A.
To draw: The pedigree in the given case.
Introduction: Cystic fibrosis is a hereditary disease generated due to the mutation in the cystic fibrosis transmembrane conductance regulator (CFTR) gene.
B.
To determine: The probability of the couple's first child to have cystic fibrosis
Introduction: Cystic fibrosis is the consequence of changes in the cystic fibrosis transmembrane conductance regulator (CFTR) gene. About1,800 distinct mutations have been known that can induce cystic fibrosis. People acquiring two recessive CFTR alleles possess the disease.
C.
To determine: The probability of the second child being normal if the first child does have cystic fibrosis.
Introduction: Cystic fibrosis is an autosomal recessive disease, and this is the kind of condition one can acquire if both of the parents share a particular copy of a recessive gene. A recessive gene is one that can be concealed by a dominant gene.

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Chapter 2 Solutions
ACHIEVE:INTRO TO GENETIC ANALYSIS 1TERM
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