BIOL201 Lecture Notes - Genetic Linkage, Y Chromosome, Wild Type

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Biology 207 - practice questions 8 - recombination mapping. Question 1 in the handout you can see the genetic map of drosophila. Find the ebony gene (e) and the rough gene (ro) on the third chromosome. Flies that are homozygous for the e- allele have a black cuticle instead of a tan cuticle. Flies that are homozygous for the ro- allele have rough eyes instead of smooth eyes. Let"s say you crossed male flies from a pure- breeding e- strain with female flies from a pure-breeding ro- strain. Question 2 on the drosophila genetic map notice that all of the genes on the fourth chromosome are at the same location, 0. 0. Notice also that the y chromosome isn"t even shown. He could have then intercrossed the f1 flies (let the male and female offspring mate) and then scored the f2 flies. Make a diagram showing the crosses listing the genotypes and phenotypes.

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