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Question
__________ and _________ were the great critics of Lamarckism.
__________ and _________ were the great critics of Lamarckism.
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Solution
The correct option is A Cuvier and Weismann
Lamarckism was proposed by Jean Baptiste de Lamarck. This theory states that during the lifetime of an organism, new characters develop due to the demand of the environment and internal desire of the organism. These new acquired characters are inherited from one generation to another.
A group of scientists have further studied Lamarckism and have supported its modified form, which is known as Neo-Lamarckism. Cope, Detlefson, Spencer and Packard are the Neo-Lamarckians. They suggested that if not all, some of the acquired characters are inherited to some extent in the offspring. For example - exposing the young stages of potato beetles to extreme conditions of moisture and temperature, produce marked changes in offspring and these modifications were all inherited in the succeeding generations.
Lamarck's theory was exposed to severe criticism and Lamarck had to defend it throughout his life. Cuvier and Weismann were the great critics of Lamarckism.
Cuvier did not believe in Lamarckism. He established the extinction of some organisms as a fact against Lamarckism. According to Cuvier, most extinctions happened due to periodic catastrophic flooding events or geological upheavals. It is not because of acquired characters in the offspring.
Weismann established that somatic changes acquired during the lifetime of the organism are non heritable, whereas the changes occurring in the germplasm are all inherited by the offspring. He proved this by removing the tail of mice continuously for 22 generations and even the offspring of the 22nd generation had a tail as long as in the original parents.
Lamarckism was proposed by Jean Baptiste de Lamarck. This theory states that during the lifetime of an organism, new characters develop due to the demand of the environment and internal desire of the organism. These new acquired characters are inherited from one generation to another.
A group of scientists have further studied Lamarckism and have supported its modified form, which is known as Neo-Lamarckism. Cope, Detlefson, Spencer and Packard are the Neo-Lamarckians. They suggested that if not all, some of the acquired characters are inherited to some extent in the offspring. For example - exposing the young stages of potato beetles to extreme conditions of moisture and temperature, produce marked changes in offspring and these modifications were all inherited in the succeeding generations.
Lamarck's theory was exposed to severe criticism and Lamarck had to defend it throughout his life. Cuvier and Weismann were the great critics of Lamarckism.
Cuvier did not believe in Lamarckism. He established the extinction of some organisms as a fact against Lamarckism. According to Cuvier, most extinctions happened due to periodic catastrophic flooding events or geological upheavals. It is not because of acquired characters in the offspring.
Weismann established that somatic changes acquired during the lifetime of the organism are non heritable, whereas the changes occurring in the germplasm are all inherited by the offspring. He proved this by removing the tail of mice continuously for 22 generations and even the offspring of the 22nd generation had a tail as long as in the original parents.
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