Cell sex date

It is difficult to do genetics experiments in birds, and their sex chromosomes are quite different to those of mammals.

To investigate further, Arnold and his team turned to the more tractable laboratory mouse.

On investigation, she was surprised to find that the probable reason for this out-of-hours feeding was the genetic sex of their cells — the number and kind of sex chromosomes they contain.

“It wasn't at all what we expected,” says Reue, a geneticist at the University of California, Los Angeles (UCLA).

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