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 ...

Why it matters: Many patients do not know they are pregnant after six weeks. In medical terms, pregnancy begins the first day ...

Chromosomeabnormalities represent the largest categoryof causes of deaths in humans (Table 6.1). Abortuses that have reached a 2-week stage of development are estimated to have a 38% rate of ...

Dozens of labs around the world are striving to grow models of human embryos to study development, fertility and therapies.

Scientists have captured the first instance of an early stage embryo forming ... that often 'goes awry or is disrupted' ...

Our weekly roundup of the latest science in the news, as well as a few fascinating articles to keep you entertained over the ...

Adequate body condition is important for embryo survival. The embryo will implant itself in the uterus roughly three weeks ...

Abortion is expected to be a major motivator for Democrats and women this November, and was a dominant theme of the party’s national convention last week, including Vice President Kamala Harris ...

a: Lateral view of a 4-week embryo showing the relationship of primordial gut to yolk sac. b: Drawing of median section of the embryo showing the early digestive system and its blood supply.

Here's what to know about the amendment, what a 'yes' or 'no' vote could mean, and what proponents and opponents think of the ...