Question 2

Reproductive success is driven by naturally occurring processes in natural selection and by human-imposed processes in artificial selection.

Artificial selection is characterized by human intervention in the breeding processes, leading to specific traits being favored, whereas natural selection occurs without human influence, allowing organisms best suited to their environment to reproduce successfully.

A) In natural selection, variation is heritable; in artificial selection, variation is not heritable.

This statement is incorrect because heritability of variation is a common feature in both natural and artificial selection. In both processes, the traits that are selected for can be passed down to offspring.

B) In natural selection, there is differential reproduction; in artificial selection, there is not differential reproduction.

This option is misleading. Differential reproduction occurs in both natural and artificial selection; however, the mechanisms driving this reproduction differ. In artificial selection, humans actively select which organisms reproduce, while in natural selection, environmental factors determine reproductive success.

C) In natural selection, there is variation within the population of organisms; in artificial selection, there is no variation within the population or organisms.

This statement is incorrect. Artificial selection often involves selecting from a population with variation to promote specific traits, although it may reduce genetic diversity over time. Natural selection inherently involves variation among organisms, which is crucial for the process.

D) In natural selection, reproductive success is driven by naturally occurring processes; in artificial selection, reproductive success is driven by human-imposed processes.

This statement accurately describes the fundamental difference between artificial and natural selection. Natural selection relies on environmental pressures that favor certain traits, while artificial selection is dictated by human choices and preferences.

Conclusion

The correct answer, D, effectively captures the essential distinction between artificial and natural selection regarding the influences on reproductive success. All other options fail to accurately represent the differences, either by misrepresenting heritability, reproduction dynamics, or the presence of variation in the populations involved.