Experimentally elevated sexual selection increases male manipulation of the female post-mating response, but also makes females poised in readiness for mating and more resistant to male manipulation.
A study of the effect of chromosomal inversions on gene expression.
No evidence that Y-chromosome differentiation affects male fitness in a Swiss population of common frogs
Male frogs in the same population with Y chromosomes of varying differentiation level from the X have no significant difference in morphometrics, amplexus success and fathering success.
Plants with 2 Y chromosomes suffer infertility, but not inviability, perhaps because XX individuals that produced male flowers had an advantage in establishing populations in the past. Or YY plants have abnormal gene dosage.
The Y chromosome of Mercurialis annua is homomorphic yet 1/3 is not recombining and is enriched in sex-biased genes, perhaps a sign of ongoing sexual antagonism.
No YY plants are produced when the Y is wild type, confirming the Y is significantly degenerated.