Woram, R. In the current study, by using an experimental backcross for over generations we could directly observe the genomic consequences of hybridisation with backcrossing. December Kunkel, L. After approximately generations of backcrossing, the platyfish X-chromosome derived sex-determining region X-SD has moved to what was previously an autosomal location.
Even yy sex chromosomes in Stafford sister taxa of fishes, instances are known where either males or females are heterogametic. Li, H.
The X and Y chromosomes are thought to have evolved from a pair of identical chromosomes,   termed autosomeswhen an ancestral animal developed an allelic variation, a so-called "sex locus" yy sex chromosomes in Stafford simply possessing this allele caused the organism to be male.
Morescalchi A Chromosomes, sex determination and environment in teleosteans. Benezech, M. Mechanisms of Development. Weird animal genomes and the evolution of vertebrate sex and sex chromosomes.
Download as PDF Printable version. Sign up for Nature Briefing. Acrocentric yy sex chromosomes in Stafford Targeted Y-CNV studies The AZF loci on the long arm are among the most active rearrangement hotspots in the human genome, and are some of the most studied because of their medical relevance Repping et al.
So CCDS's gene number prediction represents a lower bound on the total number of human protein-coding genes. Nielsen, J. As intriguing as these concepts are, empirical evidence for the evolution of new sex chromosome systems following hybridization is very scant because these events have happened in the evolutionary past and would be expected to take long time periods to complete.