Ancient U/V sex chromosomes reveal slow expansion of recombination suppression in Polytrichaceae mosses.
Sex chromosomes evolving in haploid versus diploid life cycles provide complementary systems for testing theories of sex chromosome evolution, yet haploid sex chromosomes remain poorly studied. In dioicous bryophytes, females and males carry non-recombining U and V chromosomes, respectively, providing a unique opportunity to examine the consequences of long-term recombination suppression…
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