To work this problem, remember that 1% recombination equals 1 map unit and a recombination frequency of 50% means that genes at the two loci are assorting independently (located in different linkage groups).

The recombination frequency between a and b is 10%; so these two loci are in the same linkage group, approximately 10 m.u. apart.

Linkage group 1

Linkage group 2

There is 50% recombination between f and all the other genes; so f must belong to a third linkage group:

Linkage group 1 a<

Linkage group 1 a<

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