Sex-chromosome differentiation and 'sex races' in the common frog (Rana temporaria).

ABSTRACT: Sex-chromosome differentiation was recently shown to vary among common frog populations in Fennoscandia, suggesting a trend of increased differentiation with latitude. By rearing families from two contrasted populations (respectively, from northern and southern Sweden), we show this disparity to stem from differences in sex-determination mechanisms rather than in XY-recombination patterns. Offspring from the northern population display equal sex ratios at metamorphosis, with phenotypic sexes that correlate strongly with paternal LG2 haplotypes (the sex chromosome); accordingly, Y haplotypes are markedly differentiated, with male-specific alleles and depressed diversity testifying to their smaller effective population size. In the southern population, by contrast, a majority of juveniles pr

SUBMITTER: Rodrigues N 

PROVIDER: S-EPMC4426610 | biostudies-literature | 2015 May

REPOSITORIES: biostudies-literature