Exam 17: Complex Patterns of Inheritance

You are mapping the location of two genes in Drosophila, listless l and blind b. (l+ l+ b+ b+) and (l+ l- b+ b-) flies are normal, but ( l- l- b- b-) flies don't move around very much and cannot detect the location of a light source. You perform a testcross and get the following results: listless, sighted 100 listless, blind 400 normal activity, sighted 400 normal activity, blind 100 What is the distance between these two genes on the chromosome?

You breed a black, long-haired rabbit with a white, short-haired rabbit. All of the offspring have long, black hair. If the genes for hair color and length are linked, what would be a possible ratio for the F₂ population?

An experimenter crosses two fruit flies with different phenotypes. The results in the F2 generation are: 478 crooked legs, trembling behavior 372 stumpy legs, circling behavior 175 crooked legs, circling behavior 98 stumpy legs, trembling behavior What were the genotypes / phenotypes in the Parental generation?

Maternal effect genes are inherited via the mitochondria.