Q1. You have performed a cross between two fruit flies. The female fly has homozygous wild type phenotype. The male fly is homozygous for the XYZ phenotype. In the F2 generation, you find that you have 235 flies displaying the wild type phenotype and 765 flies displaying XYZ phenotype. Which phenotype, Wild type or XYZ, is dominant?

Q2. Professor Markus is a brilliant mathematician who is 70 years old and still enjoys teaching. Over the past few years, she has found it increasingly tricky to remember the names of her students. Propose several possible explanations for the professor’s memory problems.