1a. Design and perform a cross between a female fly with vestigal wing size and

Question

1a.

Design and perform a cross between a female fly with vestigal wing size and a male fly with an incomplete wing vein mutation. Carefully study the phenotype of this male fly to be sure that you understand the effect of the incomplete allele. What phenotype did you observe in the F1 Generation?

1b. Mate the F1 flies to the F2 Generation. A punnent square for a dihybrid cross predicts 4 phenotypes in the F2 generation in a 9:3:3:1 ration. Study the results of your F1 and F2 Generation.

* Is the vestigal wing mutation dominant or recessive?

* Which Phenotype is missing and why?

* What is the phenotypic ratio of the F2 Generation?

*Which Mutation is epistatic to the other?

1c. Perform another experiment by mating a female fly with the apterous wing size mutation with a male fly with the radius incomplete vein structure mutation. Follow this cross to the F2 Generation.

*Is the apterous wing mutation dominant or recessive?

*Which mutation is epistatic to the other?

Explanation / Answer

1a) Parents: vestigial-winged female (vg vg, ri+ri+) x incomplete wing vein mutation (vg+vg+,ri ri)

   F1: All the F1 progeny were wild type.

b). The F1 flies were allowed to interbreed.

1c)

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