The recombination frequencies between three genes were determined. Genes k and a

Question

The recombination frequencies between three genes were determined. Genes k and a had a recombination frequency of 39%, while genes a and e had a recombination frequency of 26%. Genes k and e showed 50% recombination. What is the distance in map units between genes k and e?

a) 39 m.u. b) the distance between k and e can not be determined c) 65 m.u. d) 26 m.u. e) 13 m.u.

To find the gene order of the three genes we do NOT need to know the:

a) number of wild type progeny

b) dominance and recessiveness of the alleles

c) phenotypes of the individual progeny

d) frequency of recombination

e) number of double crossover events

Explanation / Answer

b) The distance between k and e can not be determined. A recombination frequency (RF) of 50% often means that the genes do not belong to the same linkage group and are present on different chromosomes. Thus, in this case the distance can't be determined.

b) dominance and recessiveness of the alleles. Order of genes is dependent on recombination events based on their distances.

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