A dominant gene R and the recessive a causes retinitis pigmentosa, a form of blindness in man.  Thus only rrA_ individuals are normal.  A couple, both afflicted, have five children: four afflicted and one normal. What are the genotypes of the parents?

Biology (MindTap Course List)
11th Edition
ISBN:9781337392938
Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg
Publisher:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg
Chapter16: Human Genetics And The Human Genome
Section16.3: Genetic Diseases Caused By Single-gene Mutations
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A dominant gene R and the recessive causes retinitis pigmentosa, a form of blindness in man.  Thus only rrA_ individuals are normal.  A couple, both afflicted, have five children: four afflicted and one normal.

What are the genotypes of the parents?

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