The statement "Natural selection does not change the alleles an organism has" is accurate.
Natural selection acts on the variations that are already present in a population, influencing which individuals survive and reproduce based on their traits. It does not change the genetic makeup of an individual directly, but rather affects the frequency of alleles in a population over time by favoring certain traits that enhance survival and reproduction.
The other statements are inaccurate:
- Natural selection can impact reproduction rates by favoring organisms that reproduce more successfully.
- Natural selection does not inactivate genes but can select against certain traits or alleles.
- Natural selection can occur as a result of mutations, which provide the raw material for variation.