Fig. 3From: Measurements of hybrid fertility and a test of mate preference for two house mouse races with massive chromosomal divergenceDiakinesis preparation from testes of a male F1 hybrid between the races CHHN and CHBU. The chain of fifteen chromosomes is visible in the centre, with two sets of metacentric bivalents above and below (filled arrows), the chromosome 19 bivalent (dashed arrow) and the sex bivalent (arrowhead)Back to article page