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The recombination frequency between a and d is 14%; so d is located in linkage group 1. Is locus d 14 m.u. to the right or to the left of gene a? If d is 14 m.u. to the left of a, then the b-to-d distance should be 10 m.u. + 14 m.u. = 24 m.u. On the other hand, if d is to the right of a, then the distance between b and d should be 14 m.u. — 10 m.u. = 4 m.u. The b- d recombination frequency is 4%; so d is 14 m.u. to the right of a. The updated map is:

2. A series of two-point crosses entailed seven loci (a, b, c, d, e, f, and g), producing the following recombination frequencies. Using these recombination frequencies, map the seven loci, showing their linkage groups and the order and distances between the loci of each linkage group:

Recombination

Recombination

Recombination

Loci

frequency (%)

Loci

frequency (%

a and b

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