8 finding the order of gene linkage and map distances

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Unformatted text preview: ng the order of gene linkage and map distances using 3 point crosses .establish heterozygote (trihybrid) a b c/a b c x a+ b+ c+ /a+ b+ c+ a b c/a+ b+ c+ heterozygote .testcross a b c/a+ b+ c+ x a b c/a b c .progeny (23 phenotypes) a+ b+ c a+ b+ c+ a+ b c+ a+ b c a b+ c+ a bc a b+ c a b c+ 9 1654 131 252 241 1779 118 13 9 Parental class will be the two with the highest frequency. All others are recombinants. Next two highest frequencies will be single crossover recombinants between the two most distant adjacent genes = region I Region I Region II 10 Parental class will be the two with the highest frequency. All others are recombinants. Next two highest frequencies will be single crossover recombinants between the two most distant adjacent genes = region I Next two highest will be single crossovers between two closest adjacent genes = region II Two with the least frequency are double crossovers. 11 Finding map dis...
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This document was uploaded on 02/25/2014.

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