Ib Biology Genetics Question Bank -

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In Drosophila , body color (grey vs. ebony) and wing length (long vs. vestigial) are linked genes. A grey-bodied, long-winged fly (heterozygous for both) is crossed with a double recessive fly. The offspring are: 435 grey long, 430 ebony vestigial, 35 grey vestigial, 32 ebony long. (a) Calculate the recombination frequency. [2] (b) Draw a genetic map showing the distance between these two genes. [1] Ib Biology Genetics Question Bank

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