What traits would you expect in a species with strong sperm competition? (Select two answers)

Question

What traits would you expect in a species with strong sperm competition? (Select two answers)

BlackTom AI · Accepted Answer

When analyzing traits associated with strong sperm competition, we need to consider how mating systems influence selection on both sexes and the male reproductive traits.
Option 1: Promiscuous females. In species where sperm competition is intense, females often mate with multiple males. This promiscuity increases the number of competing sperm from different males, shaping selective pressures on males to optimize their ejaculate and mating strategies. Therefore, the expectation that females are promiscuous in such systems is a logical consequence of high sperm competition.
Option 2: Large testes proportional to body size. A classic prediction of high sperm competition is that males evolve larger testes relative to body size to produce more sperm and increase a male’s chance of fertilizing eggs when many males contribute sperm. This trait directly reflects the competitive environment within the female reproductive tract and is a well-supported pattern across species.
Given that the question asks for two traits likely present under strong sperm competition, these two options align with well-established evolutionary theory. There are no additional options provided to evaluate, so the focus rests on these two corresponding predictions about mating systems and male gamete production.

What traits would you expect in a species with strong sperm competition? (Select two answers)Multiple choice

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