Genes A B C D E and F are all present and linked on the same

Genes A, B, C, D, E, and F are all present and linked on the same chromosome. A series of two-point test crosses are done among all pairs of genes, yielding the observed recombination frequencies shown in the table below. Based on the values on this table, map the relative locations and map distances of the six genes on the chromosome.

Solution

The recombination frequency is directly proportional to the distance between the genes on the chromosomes. Farther the distance between the genes, higher is the recombination frequency between the genes. Using this we could determine the gene order on the chromosome.

The gene order on the chromosome is as follows

F-----A---E---B---D---C