hich of the following are true? Genetic Map Based on Recombination Frequencies i

Question

hich of the following are true? Genetic Map Based on Recombination Frequencies in Drosophila MUTANT WILD TYPE Short aristae 0 Long aristae Gray body Red eyes Normal wings Red eyes 48.5 Black body Cinnabar eyes 57.5 Vestigial wings 65.5 Brown eyes Values in centimorgan (cM) map units; recombination 104.5 frequency of 0.01-1 CM Recombination of body color and red/cinnabar eyes will occur more frequently than body color and wings. Recombination of body color and red/cinnabar eyes will occur more frequently than body color and aristae. Recombination of aristae and red/cinabar eyes will occur more frequently than body color and aristae. Recombination of body color and aristae will occur more frequently than red/cinnabar and aristae.

Explanation / Answer

Recombination frequency is directly proportional to the distance between two genes. Two genes show 1% recombination frequency (RF) if they are located 1 map units (m.u.) of 1 centi Morgan (cM) apart. Distance between body color and aristae is 48.5 m.u. Distance between aristae and red/cinnabar eyes is 9 m.u. (57.5 - 48.5 = 9) Distance between red/cinnabar eyes and wings is 8 m.u. (65.5 - 57.5 = 8) Distance between wings and brown/red eyes is 39 m.u. (104.5 - 65.5 = 39) Option 1 is INCORRECT as distance between body color and wings > distance between body color and red/cinnabar eyes. Option 2 is INCORRECT. Option 3 is CORRECT as distance between aristae and red/cinnabar eyes (57.5 m.u.) > distance between body color and aristae (48.5 m.u.) Option 4 is INCORRECT.

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