I am so lost on this. Please help. 20. In yeast an ab spore is fused with a b* s

Question

I am so lost on this. Please help.

20. In yeast an ab spore is fused with a b* spore. The resulting dihybrid yeast (a a, b b*) underwent meiosis; 1000 asci were dissected and the DATA WAS USED TO GENERATE THE FOLLOWING MAP: Gene a is 18 cm from gene b. 18 cM Set A Spore Number 1 Ascus Type Set B Ascus Type Spore Number i ab abt ab ab ab ab ab ab a b ab ab a b 4 140 160700 410410 180 Above are two POSSIBLE data sets that could have been produced by this cross. Which data set would generate THIS MAP (i.e. Set A or Set B), and WHY? (5 points)

Explanation / Answer

Answer: Set B

Map distance= Recombination frequency

18 cm = 18% (180) recombinants

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