Figure 1. Copy number ratio of W marker and Z marker.
A: Square root of the ratio between W marker (W6) and Z marker (Smp_011570.1). Males and females are clearly differentiated from the ratios observed: Females have a high copy number of W marker compared to the Z marker, while in males W markers are absent or rare. B: end point characterization of PCR products. We electrophoresed multiplexed PCR products generated using W and Z marker primers on 2% agarose gels. The size standard is a 100bp ladder (Promega). Females have a 195 bp W6 specific band, and males have a 404 bp Z-specific band. “Double band” individuals are genotypically male but have elevated numbers of W markers relative to most males.