The opposite is seen for N EZ and N EYwhich are maximized when there are more males than females in the reproductive pool. Several genes that are known to contribute to hybrid incompatibility are heterochromatic or interact with heterochromatin. Does the speciation clock tick more slowly in the absence of sex chromosomes?
Additional factors involving selection and drift Selection is more efficient and drift is less potent when recombination rates are high.
Influence of sex and genetic variability on expression of X-linked genes in human monocytes. The American Journal of Medicine. What are some examples of sex linked traits? See author's posts. The two-fold increase in expression of Y genes in XYY males was consistent despite widely differing absolute expression levels, as reflected by RNA-Seq read counts.
Bibcode : PLoSO Sex chromosome. Why are autism spectrum conditions more prevalent in males? Retrieved
Initial sequence of the chimpanzee genome and comparison with the human genome. Y—Y crossing-over often results in isodicentric Y chromosomes indicating that interchromatid exchange has occurred Lange et al. Nat Commun
Invariant sites are not shown. Thus, although the present estimates are based on relatively small data sets, it is clear that X-to-Y gene conversion can be highly effective in increasing the level of diversity among human Y chromosomes, although this effect is restricted to the X—Y GSV sites. Upon secondary contact these alleles interact, causing fitness to be reduced.