(Solved): 1. In corn, the G gene encodes an enzyme that synthesizes anthocyanin and produces purple leaves. ...

1. In corn, the $$G$$ gene encodes an enzyme that synthesizes anthocyanin and produces purple leaves. $$g/g$$ plants have green leaves. A second gene $$R$$ is required for smooth leaves and $$\mathrm{r}/\mathrm{r}$$ plants have wrinkled leaves. A heterozygous plant with purple-smooth leaves was crossed to a plant with green-wrinkled leaves. The F1 generation produced 1447 plants with purple-smooth leaves, 151 purple-wrinkled, 137 green-smooth, and 1510 green-wrinkled. 1a.) What would you expect (assuming the genes are unlinked) the percentage of recombinant offspring in the F1 generation to be? 1b.) Based on the distribution of progeny phenotypes, the $$G$$ and $$R$$ genes appear to be linked. In one or two sentences, explain why. 2. Explain the role of DNA double strand breaks in crossing over. $$2\mathrm{b}$$. Generally, how are these breaks distributed on a chromosome? Are they randomly occurring or is there a pattern? 2c. Why do genes that are closer to each other on a chromosome show lower recombination frequencies?