Genetics: Analysis and Principles 5th Edition by Robert Brooker

Exercise 37

In a species of plant, two genes control flower color. The red allele ( R ) is dominant to the white allele ( r ); the color-producing allele ( C ) is dominant to the non-color-producing allele ( c ). You suspect that either an rr homozygote or a cc homozygote will produce white flowers. In other words, rr is epistatic to C , and cc is epistatic to R. To test your hypothesis, you allowed heterozygous plants ( RrCc ) to self-fertilize and counted the offspring. You obtained the following data: 201 plants with red flowers and 144 with white flowers. Conduct a chi square analysis to see if your observed data are consistent with your hypothesis.