1. Being able to roll your tongue is dominant over not being able to do so. A man and a woman who can both roll their tongues have a child who cannot roll its tongue. What are the genotypes of the parents? 2. Cystic fibrosis is the most common genetic disease among people of northern European descent. This disease is recessive and until very recently it always caused death before the child matured and had a chance to reproduce. Two normal people marry and have a child that has cystic fibrosis. a) What is the genotype of the parents? b) b) What is the chance that their second child will also have cystic fibrosis? Rrand RrCF cfand CF cf1/4
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