In humans, sex differentiation starts

in the ovum

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fourteen weeks after pregnancy

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just before parturition

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around

7^{th}

week of embryonic life

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Solution

The correct option is D around $7^{th}$ week of embryonic life
In humans, primary sex determination is based on the presence of Y chromosome because the Y chromosome has the SRY gene which is responsible for the functional development of the testes. So, in the absence of this particular gene even if the individual contains the Y chromosome the sex of the individual develops as female. The SRY gene is functional at around seven-eight weeks of embryonic life.

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