We compared codon usage among all chromosomes in each of the four species with heteromorphic sex chromosomes considered here, using the ENC statistic Wright Cold Spring Harb. XX refers to the typical sex chromosome pair in females: Two sex chromosomes that can recombine over their entire lengths.
Moreover, sterility-correlated genes showed an overrepresentation of postmeiotic genes, but fewer than expected meiotic genes. We next sought to investigate the putative functions of these co-amplified genes. Amplified Y genes were detected in each species investigated S2 Table.
Also, RNAi induced drive models may not be stoichiometric. That said, sex-biased demography is expected to dramatically shape variation across the sex-chromosomes relative to the autosomes Box 3; fig.
Email alerts Article activity alert. Understanding the molecular basis of this putative drive system will require detailed experimental work to characterize the wild-type function of these genes during spermatogenesis in the D.
Sign up for Nature Briefing. Although phylogenetic evidence points to incompletely heteromorphic or homomorphic sex chromosomes in the ancestor of winged insects, nothing outside of Diptera is known about the relationships among the sex chromosomes. Extensive X-linked adaptive evolution in central chimpanzees.
Our comparative analysis shows that co-amplification of genes on sex chromosomes similarity autosome and sex chromosome in Massachusetts common in Drosophila. Ross, M.
Why study the evolutionary genetics of sex chromosomes? High-density interspecific genetic maps of kiwifruit and the identification of sex-specific markers. By contrast, low-coverage, whole-genome sequence data from the Genomes Project indicate that X chromosomes are significantly less polymorphic than autosomes after normalizing for mutation rate differences, but vary across populations.