A man has extra digits (six fingers on each hand and six toe…

A man has extra digits (six fingers on each hand and six toes on each foot). His wife and their daughter have the normal number of digits (five fingers on each hand and five toes on each foot.) Having extra digits is a dominant trait. The couple’s second child has extra digits. What is the probability that their next (third) child will have extra digits?

Cystic fibrosis is caused by mutations in the CF gene, and t…

Cystic fibrosis is caused by mutations in the CF gene, and there are several different mutations that are known to result in CF disease.  The CF mutations behave as recessive alleles to the WT CF allele.  If two carriers that have different mutations in their CF genes have children what is the probability that one of their children will have CF disease? 

A homozygous milk chocolate Easter bunny is crossed with a h…

A homozygous milk chocolate Easter bunny is crossed with a homozygous dark chocolate Easter bunny. Assuming milk chocolate is dominant over dark chocolate and the traits segregate according to Mendelian genetics, which traits will be observable in the offspring?