A fundamental difference between Darwinian and Lamarckian evolution is:

Question

BlackTom AI · Accepted Answer

The question asks to identify a fundamental difference between Darwinian and Lamarckian evolution. To approach this, I will evaluate each option on its own terms, noting how well it captures the historical and theoretical distinctions between the two views.
Option 1: 'Darwinian evolution concerned both plants and animals, while Lamarckian evolution focused on animals.' While Darwin's theory applies broadly to all living organisms, this characterization ignores the core distinction between the mechanisms proposed by Darwin and Lamarck about how traits change. The emphasis here is on the scope (plants vs. animals) rather than on the mechanism of evolution, so this option misstates the fundamental difference and is therefore inaccurate.
Option 2: 'Darwinian evolution involves the evolution of acquired traits.' This is incorrect because Darwinism does not posit that acquired traits (changes occurring during an organism’s life) are inherited. In fact, natural selection acts on heritable variation, and the inheritance of acquired traits was explicitly challenged by Darwin’s contemporaries. The idea conflates acquired characteristic changes with heritable variation, which is a misrepresentation of Darwinian theory.
Option 3: 'Lamarckian evolution requires a knowledge of genetics, while Darwinian evolution does not.' This claim is historically unfounded. Lamarck proposed mechanisms like use/disuse and inheritance of acquired traits long before modern genetics existed; Lamarck’s theory did not require genetics as we understand it today, and Darwinian theory does not depend on genetic knowledge either. The statement incorrectly ties each theory to a specific level of genetic understanding rather than to their core mechanisms, making it inaccurate.
Option 4: 'Darwin argued that evolution occurs at the population level, while Lamarck argued that evolution happens via the acquired traits of individuals.' This option captures a central divergence: Darwinian evolution emphasizes population-level processes and natural selection acting on variation within populations over generations, whereas Lamarckism centers on the idea that individuals acquire traits during their lifetime and pass them on, leading to evolution. The wording aligns with the historical contrast between natural selection in populations versus the inheritance of acquired characteristics in individuals.
Option 5: 'Nothing. They are the same idea, it is just that Darwin thought of his idea before Lamarck.' This is a simplification that ignores the fundamental mechanistic difference between the theories. They are not the same idea; Lamarckian inheritance (acquired traits) contrasts with Darwinian natural selection acting on heritable variation. Therefore, this option misrepresents the relationship between the two theories.
In summary, options 1, 2, 3, and 5 each contain substantial inaccuracies or mischaracterizations about the core distinctions between Darwinian and Lamarckian evolution, while option 4 accurately reflects the key difference between population-level natural selection and the idea of inheritance of acquired traits at the individual level. The reasoning above shows why the other statements fail to capture the essential contrast, and why the fourth statement aligns with the well-established historical and theoretical divergence between the two evolutionary ideas.

A fundamental difference between Darwinian and Lamarckian evolution is:单项选择题

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