Hill-Robertson Interference Reduces Genetic Diversity on a Young Plant Y-Chromosome.

ABSTRACT: X and Y chromosomes differ in effective population size (N_e ), rates of recombination, and exposure to natural selection, all of which can affect patterns of genetic diversity. On Y chromosomes with suppressed recombination, natural selection is expected to eliminate linked neutral variation, and lower the N_e of Y compared to X chromosomes or autosomes. However, female-biased sex ratios and high variance in male reproductive success can also reduce Y-linked N_e , making it difficult to infer the causes of low Y-diversity. Here, we investigate the factors affecting levels of polymorphism during sex chromosome evolution in the dioecious plant Rumexhastatulus (Polygonaceae). Strikingly, we find that neutral diversity for genes

SUBMITTER: Hough J 

PROVIDER: S-EPMC5629332 | biostudies-literature | 2017 Oct

REPOSITORIES: biostudies-literature