Question

Which one or more of the following statements about evolution is/are true?

• A. Evolution is change that is heritable across generations.
• B. Evolution occurs at the level of populations, not species.
• C. Evolution is a change in gene frequencies through time.
• D. Evolution occurs through natural selection, but not sexual selection.

Hint:

To understand evolution:
1. It is a population-level process involving heritable genetic changes.
2. It encompasses both natural selection and sexual selection as mechanisms.
3. Changes in gene frequencies are central to evolutionary processes.

Answer 1

The Correct Option is A, B, C

Step 1: Analyze the definition of evolution. Evolution is defined as a process that results in heritable changes in a population over successive generations. This involves changes in gene frequencies and occurs at the population level. Step 2: Evaluate each statement. Option (A): Correct. Evolution involves changes in traits that are heritable across generations, driven by genetic variation and selection. Option (B): Correct. Evolution occurs at the population level as it involves changes in gene pools. Species-level changes result from cumulative evolutionary processes in populations. Option (C): Correct. A fundamental aspect of evolution is the change in allele (gene) frequencies over time within populations. Option (D): Incorrect. Evolution occurs through both natural selection and sexual selection. Sexual selection is a form of natural selection that involves traits improving mating success.