A plant of genotype C d/C d is crossed to c D/c D and the resulting F1 plants we

Question

A plant of genotype C d/C d is crossed to c D/c D and the resulting F1 plants were testcrossed. If the genes are 10 mu apart, the percentage of c D/c d progeny will be: a. 0 b. 5% c. 10% d. 45% e. 50% You have crossed a yeast mutant unable to grow without arginine (arg) to a mutant unable to grow without proline (pro). The following tetrads are obtained: What is the map distance between the genes mutated in the proline auxotrophic strain and arginine auxotrophic strain? a. 4 m.u. b. 23 m.u. c. 27 m.u. d. 48 m.u. e. unlinked

Explanation / Answer

The plant genotype C d/C d will produce haploid of Cd and Cd in 50:50 or equal proportion and the other plant genotype will produce haploid of c D and c d in equal proportion.

10 map unit means 10% recombinants.

This implies cD and cd will come at a frequency of (100%-10%)/2=90/2 or 45%

So the percentage of c D/c d progeny will come in 45%

or option d. is correct that is 45%

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