Working on a genetics experiment with Drosophila, you count the F2 generation of

Question

Working on a genetics experiment with Drosophila, you count the F2 generation of the dihybrid cross between a female fly who has a black body and normal wings and a male who is wildtype for body color but is apterous (no wings). An F1 female is then crossed to a true breeding male who has a black body and is wingless. You obtain the following count for the F2 generation (1.0 pts):

90 wildtype (tan body, winged)

733 black body, wildtype wings

717 wildtype body, apterous

80 black body, apterous

Calculate the recombination frequency between body color and wing traits.

Explanation / Answer

The distance between two gene loci = (80+90/ 1500)* 100 = 11.3 map units.

Means 11.3% of genes are recombinant and remaining 88.6% of offspring are parental.

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