Genetics: Analysis and Principles 5th Edition by Robert Brooker

Exercise 1

Figure 5.1 describes an example of a maternal effect gene. Explain how Sturtevant deduced a maternal effect gene based on the F 2 and F 3 generations.FIGURE 5.1 Experiment showing the inheritance pattern of snail coiling. In this experiment, D (dextral) is dominant to d (sinistral). The genotype of the mother determines the phenotype of the offspring. This phenomenon is known as the maternal effect. In this case, a DD or Dd mother produces dextral offspring, and a dd mother produces sinistral offspring. The genotypes of the father and offspring do not affect the offspring's phenotype.