You catch 2 snakes from a meadow. One’s scales are a striped pattern and the other is spotted. Eventually one snake lays eggs and when hatched you find all striped baby snakes. You release them, keeping 2 baby snakes. When they produce baby snakes, you observe 8 striped and 2 spotted. (a) Suggest a possible model to describe the inheritance of scale patterns. Define genotypes and phenotypes for the Parental, F1, and F2 snakes. Verify your model with a chi square test. SHOW ALL YOUR WORK b. Suppose instead that the F1 generation all had mottled scales (neither striped nor spotted) and their offspring (F2) were striped, mottled, and spotted. What type of dominance would this be and what ratio of offspring would you expect in the F2 generation?

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Inheritance and Mendelian Genetics

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