What makes the Y chromosome so special (despite having far fewer genes than its X counterpart) is that it contains the SRY gene, which is responsible for kick-starting male development in the embryo.

World Athletics president Sebastian Coe announced the genetic test after proposals to tighten eligibility rules in women's events were discussed.

These tests will screen athletes’ genetic samples to determine whether they contain the SRY gene, or “a genetic surrogate for a Y chromosome,” according to the organization. The decision ...

World Athletics approves a one-time genetic test for athletes who wish to compete in the women's category at international events.

World Athletics has said the cheek swabbing tests will be for the SRY gene, which is found on the Y chromosome and is a key determinator of male-typical sex development. Coe said that World ...