Which statement best describes part of natural selection basics?

Which statement best describes part of natural selection basics?

• A. Heritable variations do not influence which individuals leave more offspring.
• B. If heritable variations influence reproduction, the better reproducing variants increase.
• C. All variants reproduce equally.
• D. Natural selection operates independently of reproduction.

Answer: (B)

Natural selection is driven by heritable differences in traits that affect how many offspring an individual leaves. When a trait that can be inherited influences reproductive success, those variants that help an organism reproduce more effectively become more common in the population over time because they produce more offspring that carry the trait. This idea is captured by the statement that if heritable variations influence reproduction, the better reproducing variants increase. Think of it like this: if a heritable trait gives some individuals a higher chance of surviving to reproduce and those individuals produce more offspring, that trait becomes more frequent in the next generation. The others fade in frequency by having fewer offspring. The other choices describe situations that would stop natural selection from happening: if heritable variation didn’t affect reproduction, there would be no differential reproductive success; if all variants reproduced equally, there would be no change in trait frequencies; and if natural selection operated independently of reproduction, it wouldn’t align with the idea that fitness is measured by reproductive success.

Natural selection is driven by heritable differences in traits that affect how many offspring an individual leaves. When a trait that can be inherited influences reproductive success, those variants that help an organism reproduce more effectively become more common in the population over time because they produce more offspring that carry the trait. This idea is captured by the statement that if heritable variations influence reproduction, the better reproducing variants increase.

Think of it like this: if a heritable trait gives some individuals a higher chance of surviving to reproduce and those individuals produce more offspring, that trait becomes more frequent in the next generation. The others fade in frequency by having fewer offspring. The other choices describe situations that would stop natural selection from happening: if heritable variation didn’t affect reproduction, there would be no differential reproductive success; if all variants reproduced equally, there would be no change in trait frequencies; and if natural selection operated independently of reproduction, it wouldn’t align with the idea that fitness is measured by reproductive success.