Segregation distortion levels.

Unweighted means of k values ±standard deviation. n represents the number of flies in the offspring. For all male genotypes, k value is the ratio of offspring carrying the SD chromosome over the total number of flies except for cn1 bw1/CyO; protB-GFP and Gla/CyO; protB-GFP males. For these two genotypes, the k value represents the ratio of the offspring carrying the CyO chromosome over the total number of flies. The X chromosome carried by tested males is also indicated. The X chromosomes of the RAL-380, RAL-313 and RAL-309 strains carry a suppressor. A description of the crosses to obtain distorter and control genotypes are provided in S7 Fig.