Question

why sex determination is not inherited?​

Answer 1

Answer:

In many species, sex determination is genetic: males and females have different alleles or even different genes that specify their sexual morphology. ... Such analysis of biological systems could also signal whether the fetus is hermaphrodite, which includes total or partial of both male and female reproduction organs.

Answer 2

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The sexual differentiation is generally triggered by a main gene (a "sex locus"), with a multitude of other genes following in a domino effect. In other cases, sex of a fetus is determined by environmental variables (such as temperature). The details of some sex-determination systems are not yet fully understood.