Original sentence: Failure of ovarian development in 45,X  girls (Turner syndrome) implies that two functional copies of several Xp and Xq genes are needed.In the first weeks of gestation, a fetus has no anatomic or hormonal sex, and only a karyotype distinguishes male from female.It is obvious that the Y chromosome must carry at least one essential gene which determines testicular formation (originally termed testis determining factor).Sex differences between males and females range from chromosomes to anatomy to behavior
Edited sentence: , a fetus has no anatomic or hormonal sex, and only a karyotype distinguishes male from female.1 Chromosomal sex differences.10 Psychological and behavioral differentiation in humans.10.1 Gender identity, role, and orientation.11 External links.2 Gonadal differentiation.3 Hormonal differentiation.4 Internal genital differentiation.5 External genital differentiation.6 Breast differentiation.7 Other body differentiation.8 Brain differentiation.9 Psychological and behavioral differentiation.Contents [showhide].Failure of ovarian development in 45,X girls (Turner syndrome) implies that two functional copies of several Xp and Xq genes are needed.It is obvious that the Y chromosome must carry at least one essential gene which determines testicular formation (originally termed TDF).range from chromosomes to anatomy to behavior