Further sex differentiation of the external genitalia occurs at puberty, when androgen levels again become disparate.

Many of these cases suggest some genetic or hormonal effect on sex differentiation of behavior and mental traits.

Yeast has two mating types, a and α (alpha), which show primitive aspects of sex differentiation.

Exercise can lower the degree of sex differentiation in muscle development as adults.

For a variety of reasons, one in 100 or so babies is born with some kind of sex differentiation anomaly.

A modified form of parthenogenesis controls sex differentiation.

Figure 4.1 is an example of clear sex differentiation in all three inner-city areas.

While this constitutes the basic series of events, this brief review should be taken with caution since there are many more factors that influence sex differentiation.