Multiple choice

Which of the following characterises the sexual development of the fetus?

  1. The sex of the developing embryo is determined by a single gene present on the Y chromosome.

  2. In the absence of a Y chromosome, the sexual development of the developing embryo will fail to follow any pattern.

  3. The maturation of the fetal gonads into the female type are initiated in the presence of estrogens.

  4. The sex of the developing embryo is determined by the set of genes on the Y chromosome.
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A Correct answer
Explanation

A single gene on the Y, called SRY, triggers testes development in the early embryo and once these begin to form, the rest of the embryo also becomes male. Thus, the sex of the developing embryo is determined by a single gene present on the Y chromosome.

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