Male mice without any Y chromosome genes can father offspring after assisted reproduction — ScienceDaily

Live mouse progeny can be generated with assisted reproduction using germ cells from males without any Y chromosome genes. In these males, the two Y genes previously demonstrated to be essential for the development of testes and male gametes were replaced with their homologues encoded on other chromosomes.

Source: Male mice without any Y chromosome genes can father offspring after assisted reproduction — ScienceDaily

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