THE genetic sequence of the human Y chromosome has been published, unveiling surprises that will advance research on fertility, rekindle debates on the evolution of the sexes and challenge the controversial idea that the Y chromosome is a genetic junkyard destined for extinction.
The male-determining Y has been considered a vestigial chromosome with a tiny, ever-dwindling collection of about 40 genes. The reason for the genetic attrition, scientists thought, was Y’s inability to pair and swap genetic material with other chromosomes. That takes place during a process called crossing-over, which is key to repairing genetic mutations and preserving genes.
Because…
