In Darwinian terms, the fittest individuals of a species are those that

Question

BlackTom AI · Accepted Answer

Darwinian fitness is defined by reproductive success: the degree to which an individual's genes are represented in future generations by the number of offspring that survive and themselves reproduce.

Relevant concepts:
- Natural selection favors heritable traits that increase the number of reproducing descendants.
- Survival alone is not fitness unless it leads to more genes in the next generation.
- Inclusive fitness counts direct offspring and, in broader senses, effects on relatives’ reproduction.

Step-by-step reasoning:
1. Translate each option into the criterion of “how many reproducing descendants” it produces.
2. Consider a numeric example to show the difference: Individual A attracts many mates and produces 10 offspring, but only 1 reaches reproductive age and reproduces; Individual B attracts fewer mates, produces 4 offspring, and all 4 survive to reproduce. A’s contribution of reproducing descendants = 1; B’s = 4. B is fitter despite fewer mates or larger size.
3. Therefore fitness is measured by the count of descendants who themselves reproduce (i.e., leave genes in future generations), not by mating count, survival traits per se, or size alone.

Why the correct answer is correct:
- “Leave the greatest number of reproducing descendants” directly measures genetic contribution to subsequent generations, which is the operational definition of Darwinian fitness. Traits are only favored to the extent they increase that reproductive contribution.

Why the other options are incorrect:
- “Attract the most mates”: increases potential reproduction but does not guarantee offspring survive or reproduce.
- “Best adapted to temperature extremes”: may improve survival but not necessarily increase reproductive output.
- “Best equipped to cope with predators”: again helps survival but only matters if it increases successful reproduction.
- “Grow to the largest size”: size can be advantageous or disadvantageous and is not equivalent to reproductive success.

Conclusion: The correct choice is “leave the greatest number of reproducing descendants,” which matches the provided answer.

In Darwinian terms, the fittest individuals of a species are those thatSingle choice

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