Question

1. You carried out a cross of green (gr) females to spotted (sp) males with round (ro) shape. All F1 were wild type for all three traits. You then crossed an F1 female to a green, spotted, round shaped male. The results were:

wild type 244

green 467

spotted 31

round 9

spotted, round 433

green, round 27

green, spotted 12

round, green, spotted 212

1a. (6 points) Which gene is in the middle?

1b. (9 points) What is the distance the genes:

gr and sp?

sp and ro?

gr and ro?

1c. (5 points) What is the coefficient of coincidence in this example?

2. A female Drosophila with yellow body color is mated to a male with wild type body color. The female offspring have yellow bodies. Explain.