Lamarckism was finally rejected mainly because
Correct answer: A. changes in body cells do not alter the genes carried in the germ cells
- A. changes in body cells do not alter the genes carried in the germ cells
- B. organisms were found not to vary at all
- C. the fossil record showed no change over time
- D. no organ was ever found to degenerate through disuse
Explanation
Weismann's germ plasm idea, supported by his experiment of cutting off the tails of mice for many generations without shortening the tails of their offspring, showed that somatic changes leave the gametes untouched. Since only the gametes carry information to the next generation, an acquired character cannot be inherited. Variation and fossil change are both real and are the very evidence evolution rests on.
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About Lamarckism
Lamarckism explains evolution through environmental influence, use and disuse of organs, and the inheritance of acquired characteristics. It differs from Darwinian natural selection because Lamarck proposed that organisms develop useful traits during their lifetime and pass them on, a view not supported by modern genetics.
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Lamarck explained the long neck of the giraffe by suggesting that
The central idea of Lamarck's theory of evolution is that
Lamarck's law of use and disuse states that
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Which of the following best describes "acquired characteristics" according to Lamarckism?