Figure 4. Variation in sperm midpiece length between Prkar1a genotypes in hybrids relative to parental phenotypes.

Mean±s.e. midpiece length (n=10 sperm/male) of sperm harvested from F₂ hybrid offspring (P. maniculatus [n=10; indicated as black bar] × P. polionotus [n=10; white bar], redrawn from Fig. 1e for reference here). AA denotes males homozygous for the P. maniculatus allele at the Prkr1a locus (n=61), Aa for heterozygous males (n=130), and aa for males homozygous for the P. polionotus allele (n=50). Note truncated y axis. NS=P value>0.05, t-test.