Researchers at Lund College in Sweden have investigated how the X and Y chromosomes evolve and adapt to one another inside a inhabitants. The outcomes present that breaking apart coevolved units of intercourse chromosomes might result in decrease survival charges among the many offspring — one thing that may very well be of significance in species conservation, for instance. The examine is printed within the journal PNAS.
The outcomes present new clues on how species are shaped, and counsel it may very well be dangerous to convey collectively people from totally different populations which have been separated for a very long time. The reason being that the offspring have decrease survival charges.
“That is one thing value retaining in thoughts in conservation biology, the place you need to see a inhabitants develop,” says Jessica Abbott, researcher in evolutionary ecology at Lund College.
It’s beforehand recognized that hybrids between totally different species usually do higher if they’re feminine (two X chromosomes) fairly than male (X and Y chromosome).
Within the examine, the researchers crossed fruit flies from 5 totally different populations from totally different continents with the intention to mix X and Y chromosomes with totally different origins. They then adopted and studied the next generations.
The outcomes present that males with X and Y chromosomes that do not match had larger reproductive success than males with matching X and Y chromosomes. Nonetheless, the upper male fertility was paired with decrease survival charges amongst their offspring.
“We had been anticipating the alternative, that males with totally different origin X and Y chromosomes would have decrease reproductive success, in order that was shocking,” says Jessica Abbott.