For example, the sex-limited nature of highly derived minor sex chromosomes means that any gene content not directly involved in sex determination should still function in a sex-specific manner: the Y chromosomes should play an important role in males and W chromosomes should harbour loci important to female function.
Sex chromosomes in flowering plants. Two features set Y chromosomes apart from the rest of the genome; these are a lack of recombination on the Y over some or most of its length 6and male-limited transmission of the non-recombining segment Y chromosome degeneration The process of gene loss from the Y chromosome.
Nat Commun Interestingly, the difference is primarily due to divergence of the chimpanzee Y, as the gorilla and human Y chromosomes are rather more conserved Goto et al.
From Wikipedia, the free encyclopedia. The first 22 pairs are called autosomes. Western et al. Occasionally, there are hermaphrodites in place of one or both sexes. Topical dose delivery in the reptilian egg treatment model.
Development of such an in vitro system will require extensive optimization. Bull et al. Ainsworth, C. Colocalization of WT1 and cell proliferation reveals conserved mechanisms in temperature-dependent sex determination.
J Endocrinol. Expression of putative sex-determining genes during the thermosensitive period of gonad development in the snapping turtle, Chelydra serpentina. Expression of the turtle ribosomal protein L13a also differed between temperatures. Analyzing the coordinated gene network underlying temperature-dependent sex determination in reptiles.
Primate Y chromosomes and the future of Y chromosome Comparative genomic studies in primates provide further empirical evidence against human Y extinction Using phylogenetic data from the literature, I reconstructed the minimum number of transitions among these sex determining mechanism However, subsequent structural rearrangements leading to a species-specific number of multiple sex-chromosomes, namely fissions of several neo-sex chromosomes, could have significantly contributed to reproductive isolation due to mis-segregation of these neo-sex chromosomes in hybrids.
Does an accumulation of nonsense mutations on the neo-Y result in the production of many mal-functional proteins from a degenerating neo-Y, which in turn selects for down-regulation of these genes? This is resolved for genes on minor sex chromosomes, as male-specific selection on Y-linked traits b is unconstrained by expression in females, and similarly, female-specific selection on W-linked traits c is unconstrained by expression in males.
Is this homology coincidental or does it represent an ancient ancestral amniote super-sex chromosomes?