It is unknown how exactly temperature-dependent sex determination evolved. Lucotte, E. The molecular hallmarks of selection documented here accord remarkably well with this previous body of research: general life-history genes tend to be female- rather than male-biased in expression in this species 19 and we found that candidate SA loci were indeed enriched with genes involved in general metabolic processes and egg production.
Humans have 23 pairs of chromosomes, one half of each pair inherited from each parent. Namespaces Article Talk. Proceedings of the American Philosophical Society.
Genome Res. Sexual selection drives evolution and rapid turnover of male gene expression. University of Chicago Medical Center. However, homologues to the avian DMRT1 gene on platypus sex chromosomes X3 and X5 suggest that it is possible the sex-determining gene for the platypus is the same one that is involved in bird sex-determination.
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Wisniewski et al. At least one monotreme , the platypus , presents a particular sex determination scheme that in some ways resembles that of the ZW sex chromosomes of birds and lacks the SRY gene. The accepted hypothesis of XY and ZW sex chromosome evolution is that they evolved at the same time, in two different branches.
Cellular and Molecular Life Sciences. Sexes suffer from suboptimal lifespan because of genetic conflict in a seed beetle.