A trait that decreases the likelihood of survival may evolve due to sexual selection if the trait
the likelihood of reproduction.

Question

A trait that decreases the likelihood of survival may evolve due to sexual selection if the trait 
 the likelihood of reproduction.

BlackTom AI · Accepted Answer

This question discusses how sexual selection can drive the evolution of a trait that, while it may reduce survival, improves reproductive success.
First, consider the logic: a trait can spread if it increases the number of offspring an individual produces, even if it comes at a survival cost. The key measure is fitness, often approximated by reproductive success, not just survival.
In the fill-in-the-blank, the statement is saying the trait evolves because it 
 increases the likelihood of reproduction. This aligns with sexual selection theory: traits that help attract mates or compete for mates can be favored by selection because they boost mating opportunities and thus the number of offspring, even if those traits reduce survival odds.
Why the alternative would be incorrect here is mainly that there are no other options provided to contrast; however, the core idea remains that sexual selection favors traits that enhance mating success, not necessarily traits that merely improve survival.
To connect to concepts: if a trait makes an individual more attractive to potential mates or more successful in securing mates, its carriers tend to leave more offspring, propagating the trait through generations. This can happen despite a trade-off where the trait lowers endurance, camouflage, or predator avoidance, as long as the net effect on fitness is positive via increased reproduction.
In summary, the correct idea is that a trait can evolve through sexual selection if it increases reproductive success, even at the expense of survival, which is precisely captured by the word that belongs in the blank: increases.

A trait that decreases the likelihood of survival may evolve due to sexual selection if the trait the likelihood of reproduction.

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