elements NA to NE, and individual orthologous genes are rarely found on different elements. However, the NN and NX elements that, together, constitute theC. elegansX (see also below) are exceptions. We now study the sex chromosomes of species from all major nematode clades, and assign their ...
Sex chromosomes have evolved from the same autosomes multiple times across vertebrates, suggesting that selection for recombination suppression has acted r... S Hanna,P Suvi,C Pallavi,... - 《Proceedings Biological Sciences》 被引量: 0发表: 2020年 ...
Additionally, theory has long suggested that the evolution of sexual dimorphism is facilitated by sex chromosomes, as these are the only portions of the genome that differ between males and females. Genomic analysis indicates that there is indeed a relationship between sexual dimorphism and the sex ...
2011). Using plants as examples, the XY system evolved from a recessive mutation of a stamen-promoting gene that resulted in an intermediate gynodioecious (female and hermaphrodite) population, and a second gain of function mutation that occurred on the same chromosome, in close proximity to ...
Such flies have the same degree of discordance between X chromosomes and autosomes as do XY hybrid males, and might be expected to be sterile. Instead, they are quite fertile. X-autosome interactions cannot explain the sterility of heterogametic hybrids: Coyne suggests that it must arise from ...
Dosage compensation in birds appears to be phenotypically and molecularly quite different from X inactivation, being partial and gene-specific, but both systems use tools from the same molecular toolbox and there are some signs that galliform birds represent an early stage in the evolution of a ...
To evaluate the degeneration effects of such mutations on neo-Y-linked genes, we characterized 23 gene pairs that are located in the inverted region on the neo-Y chromosome (Additional data file 1), one pair in the neo-Y 'PAR' region, and six pairs on autosomes. These genes were ...
Sibship analyses of microsatellite polymorphisms revealed that all three species have the same pair of sex chromosomes, with complete absence of X-Y recombination in males. Despite this, sequences of sex-linked loci show no divergence between the X and Y chromosomes. In the phylogeny, the X ...
The Chinese soft-shelled turtle (Pelodiscus sinensis, Trionychidae, Testudines) has ZZ/ZW-type micro-sex chromosomes where the 18S-28S ribosomal RNA genes (18S-28S rDNA) are located. The W chromosome is morphologically differentiated from the Z chromosome by partial deletion and amplification of...
Sex chromosomes are typically viewed as having originated from a pair of autosomes, and differentiated as the sex-limited chromosome (e.g. Y) has degenerated by losing most genes through cessation of recombination. While often thought that degenerated se