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The recombination frequency between a and c is 50%; so c must lie in a second linkage group.

Linkage group 1

Linkage group 2

Linkage group 3

Linkage group 2

Finally, position locus g with respect to the other genes. The recombination frequencies between g and loci a, b, and d are all 50%; so g is not in linkage group 1. The recombination c c e b a c e b a c frequency between g and c is 12 m.u.; so g is a part of linkage group 2. To determine whether g is 12 map units to the right or left of c, consult the g- e recombination frequency. Because this recombination frequency is 18%, g must lie to the left of c:

Linkage group 1 a*

Linkage group 1 a*

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