Alfred Jost removed the testes from rabbit embryos in order to study the role of

Question

Alfred Jost removed the testes from rabbit embryos in order to study the role of these gonads in sexual differentiation. Which of the following conclusions can be drawn from his experiment?

In the absence of testes, male (XY) rabbits appear male but are infertile.

Ovaries are necessary for the development of female primary sex characteristics in rabbits.

Testosterone causes development of male sexual characteristics.

Male primary sex characteristics develop in the absence of testes as long as the rabbit has a Y chromosome.

Testes produce a factor that stimulates development of male sex characteristics.

Explanation / Answer

e. Testes produce a factor that stimulates development of male sex characteristics.

In the absence of testes, the secondary sexual characters do not develop, which indicates that testes produce a factor that stimulates development of male sex characteristics.

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