We are told this “weirdest sex chromosome system known to science” happened in the past couple of million years but it is not clear why.
Tag: sex chromosomes
Paper: So many exceptions to sex chromosome evolution
From the paper:
“Finally, the remarkable turnover of sex chromosomes in many systems, as well as variation in the rate of sex chromosome divergence, suggest that assumptions about the inevitable linearity of sex chromosome evolution are not always empirically supported, and the drivers of the birth-death cycle of sex chromosome evolution remain to be elucidated. ”