The Genetic Architecture of Natural Variation in Recombination Rate in Drosophila melanogaster
Fig 1
Two step crossing scheme to measure crossover frequency in the DGRP.
+ + denotes wild-type and m1 m2 denotes either the doubly marked e ro on chromosome 3R or doubly marked y v on the X chromosome. Since males are heterogametic, only one copy of the y or v marker is needed to display a phenotype. Crossover frequency is calculated by taking the ratio of the total number of recombinants (denoted by black box) to the total number of progeny.
