Which of the following describes a selective advantage?

A selective advantage refers to a trait or characteristic that enhances an individual's ability to survive and reproduce in a particular environment. When an organism possesses a trait that leads to a higher survivability rate, it is more likely to pass on its genes to the next generation, thereby increasing the frequency of that trait in the population over time. This concept is central to the theory of natural selection, where advantageous traits become more common as individuals with those traits have higher reproductive success.

In contrast, a phenotype that is less favorable for survival does not provide any advantage and may even decrease the chances of survival. An allele that is not heritable does not affect reproduction or survival, as it cannot be passed on to the next generation. Lastly, a condition that affects genetic drift does not directly relate to the concept of selective advantage, as genetic drift refers to the random changes in allele frequencies within a population, not the advantages provided by specific traits. Therefore, the correct choice is associated with traits that improve an organism's likelihood of surviving and reproducing in its environment.