Question

Egg laying in fruit flies can be triggered (induced) when males deposit their sperm in the spermathecae of the females. What is the selective advantage of induced egg laying for the male flies? A. Because egg laying is induced upon mating, the males do not have to produce as much sperm. B. More eggs can be fertilized at once when egg laying is induced. C. Induced egg laying ensures that a male fly's sperm is used for fertilization. D. Mating takes less time, so less energy is expended by the males.

Answer 1

When males place their sperm in the females' spermathecae, fruit flies can start laying eggs (a process known as induction). Induced egg laying has the selection benefit of ensuring that a male fly's sperm is utilized for fertilization, which is beneficial for male flies.

• The spermatheca is an ectodermal organ that only develops in Queens and is not present in workers.

• Spermathecae gets sperm from the male during mating.

• Because it assures that a male fly's sperm is used for fertilization, induced egg laying for male flies has this benefit.

Thus from the above points, we can conclude that egg laying in the fruit flies had an adantage.

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