Removal of the Testes in the Male Green Anole Lizard

Question

Removal of the testes in the male green anole lizard (Anolis carolinensis) resulted in a
A) reduction in aggressive behavior, but only if the male was returned to his home cage afterwards, rather than to a new cage.
B) reduction in aggressive behavior that resisted later testosterone replacement.
C) reduction in sexual behavior that gradually recovered with experience.
D) reduction in sexual behavior that was maintained thereafter unless treated with testosterone.

Accepted Answer

The removal of the testes, which are the primary source of testosterone in males, leads to a reduction in sexual behavior due to the decrease in testosterone levels. This effect can be reversed or mitigated by administering testosterone, which would replace the hormone that was lost due to castration.