Według mojej wiedzy to ściema, że płód ma płeć żeńską
""Basically, males and females are all built from the same genetic blueprint," Tattersall told Live Science. "Then, [they] develop in slightly different directions [in utero and] particularly after we hit puberty." [Men vs. Women: Our Key Physical Differences Explained]
During the first several weeks, male and female embryos follow the same blueprint, which includes the development of nipples. However, at about six to seven weeks of gestation, a gene on the Y chromosome induces changes that lead to the development of the testes, the organ that makes and stores sperm and produces testosterone, according to the book "Exploring the Biological Contributions to Human Health: Does Sex Matter?" (National Academies Press, 2001).
After the testes are formed, the male fetus begins producing testosterone at about nine weeks of gestation, changing the genetic activity of cells in the genitals and brain. But by then, those nipples aren't going anywhere." pokaż całość