Anatomy General anatomy 5ee0e0a5 Male-female differentiation of fetus occurs at A 2-4 weeks B 10-12 weeks C 16-18 weeks D 24-26 weeks High-Yield Explanation Genotype of embryo is established at feilization. But male and female embryos are phenotypically distinguishbletill week 6. Ref: Gray's 39e/p-1289