this confuses me, could someone help show me in detail please. I would really ap

Question

this confuses me, could someone help show me in detail please. I would really appreciate it.

o) Double crossover gametes 8) In Drosophila, the dominant gene (b+) codes for gray body color, and the dominant gene (vg+) codes for normal wings. The recessive alleles of these two genes result in black body color (b) and vestigial wings (vg) respectively. Flies homozygous for gray body and normal wings were crossed with flies that had black bodies and vestigial wings The FI progeny were then testcrossed, with the following results: Gray body, normal wings Black body, vestigial wings 236 253 50 61 Gray body, vestigial wings Black body, normal wings a) Would you say that these two genes are linked? If so, how many map units apart are they on the chromosome?

Explanation / Answer

The genes which are linked have a recombination frequency (RF) less than 50%. Hence we need to find out the RF. The phenotypes with the lesser number of progenies are the recombinants. Hence the RF would be (50+61)/600 = 0.185 x 100% = 18.5. Since 1 map units is equal to 1% recombination, the genes are 18.5 cM away. Since the RF is less than 50%, the genes are linked.

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