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. In Drosophila melanogaster, there are dominant alleles for gray-body colour and normal wings. The recessive alleles of these two genes result in black body colour and vestigial wings respectively. Flies homozygous for gray body and normal wings were crossed with flies that had black bodies and vestigial wings. Write down this cross. The F1 progeny were then test-crossed, with the following results: Gray body, normal wings 236 Black body, vestigial wings 253 Gray body, vestigial wings 50 Black body, normal wings 61 a. Write down the genotype for each phenotype. Would you say that these two genes are linked? b. If so, how many units apart are they on the chromosome? 3. The cross-over frequency between linked genes A and B is 40%; between B and C, 20%; between C and D, 10%; between C and A, 20%, between D and B, 10%. What is the sequence of the genes on the chromosome?
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