Genetics: Analysis and Principles 5th Edition by Robert Brooker

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The cream allele is a modifier of eosin and the cream allele is autosomal. By comparison, the red and eosin alleles are X-linked. Based on these ideas, conduct a chi square analysis to determine if Bridges' data of Figure 4.19 agree with the predicted ratio of 8 red-eyed females, 4 red-eyed males, 3 light eosin-eyed males, and 1 cream-eyed male.FIGURE 4.19 A gene interaction between the cream allele and eosin allele in fruit flies.