A crucial event that determines whether the embryo will develop into a male or female occurs in the second half of week six. If the Y chromosome is present in the embryo's cells, a gene within the ...

Each embryo starts out with a pair of primitive organs, the proto-gonads, that develop into male or female gonads at about six to eight weeks. Sex differentiation is usually set in motion by a ...

Early scientists credited divine providence with ensuring that "every male should have its female". Of course ... makes male hormones which direct the embryo to develop as a boy.

More than 3.5 million people in the UK endure fertility problems, with many of them suffering in silence.There’s still such a ...

UCLA's Williams Institute, which focuses on legal issues that affect transgender people, estimates that about 0.3 percent ... in a male embryo having a feminized brain, or a female embryo having ...

Mature egg cells, or oocytes, are essential for fertilization in assisted reproductive technologies. However, some 'denuded' ...

When Briony and her husband embarked on their journey to start a family, they didn't think artificial intelligence (AI) would play a role.

This tissue forms sex cords which will develop into testes if the bird becomes a male ... a few weeks in the kangaroo) Young are born at very early stage and climb outside belly of mother to pouch.

From our morning news briefing to a weekly Good News Newsletter, get the best of The Week ... male surgeons “wiping their brow on their breasts”, and men “rubbing erections against female ...

Dallas Center-Grimes girls cross country runner Piper Messerly and Ankeny boys cross country runner Ethan Zuber were voted the Des Moines Register's metro-area female and male Athlete of the Week ...