Question

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tion 67 et ered s out of How would a prenatal castration affect the sexual behavior of a male rat? Select one: O a. It would have no effect on the sexual behavior of the rat when it becomes an adult. lag ion b. Prenatally castrated male rats are more likely to display temale patterns copulation (i.e. be sexually attracted to female rats) as adults than control rats. O c. Prenatally castrated male rats are more likely to be asexual as adults, displaying neither male nor female patterns of copulation very frequently. d. Their sexual behavior would have components of male-typical and female-typical sexual behavior tion 68 When should males be selective, and females relatively unselective, when choosing a mate? ered Select one: s out of a. When reproductive costs to both sexes are high b. When reproductive costs to both sexes are low a. When reproductive costs to males are high and costs to females are low d. When reproductive costs to males are low and costs to females are high lag tion

Answer 1

Solutions

67. The correct answer is Option C – Prenatally castrated male rats are more likely to be asexual as adults, displaying neither male nor female patterns of copulation very frequently.

Several studies have reported the effects of prenatal castration of rats and studying their behavior when they reach adulthood. It has normally been found that the castrated rats do not respond in the same way as their normal male counterparts. However, if they were to undergo a treatment of testosterone injections, then they show male sexual behavior. It was also seen that if in the place of testosterone, female sex hormones (estrogen and progesterone) were administered, and then the male rats showed female-like behavior. These findings indicate that ‘the male rat castrated at birth is not fixated as either a male or a female when they reach adulthood; either owing to hormone therapy or by sexual experience’.

68. The correct answer is Option C – When reproductive costs to males are high, and costs to females are low.

When reproductive costs are high, there are fewer options when selecting a mate. The animal has to then invest a lot a time into choosing the right mate, failing which the rate of reproductive success will be low. Hence they tend be selective while choosing a mate.