freinds help me in this quetion . write short note on lamarckism.
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Lamarckism (or Lamarckian inheritance) is the hypothesis that an organism can pass on characteristics that it has acquired during its lifetime to its offspring. It is also known as the inheritance of acquired characteristics or soft inheritance. It is named after the French biologist Jean-Baptiste Lamarck (1744–1829), who incorporated the action of soft inheritance into his evolutionary theories as a supplement to his concept of orthogenesis, a drive towards complexity. Lamarck did not originate the idea of soft inheritance, which was known from the classical era onwards, nor was it the primary focus of his theory of evolution.
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omkar142:
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Lamarck's two-factor theory involves 1) a complexifying force that drives animal body planstowards higher levels (orthogenesis) creating a ladder of phyla, and 2) an adaptive force that causes animals with a given body plan to adapt to circumstances (use and disuse, inheritance of acquired characteristics), creating a diversity ofspecies and genera. Popular views of Lamarckism only consider an aspect of the adaptive force.
Lamarckism (or Lamarckian inheritance) is the hypothesis that anorganism can pass on characteristics that it has acquired during its lifetime to its offspring. It is also known as theinheritance of acquired characteristicsor soft inheritance. It is named after the French biologist Jean-Baptiste Lamarck(1744–1829), who incorporated the action of soft inheritance into his evolutionary theories as a supplement to his concept of orthogenesis, a drive towards complexity. Lamarck did not originate the idea of soft inheritance, which was known from the classical eraonwards, nor was it the primary focus of his theory of evolution.
When Charles Darwin published histheory of evolution by natural selectionin On the Origin of Species (1859), he continued to give credence to what he called "use and disuse inheritance", but rejected other aspects of Lamarck's theories. Later, Mendelian geneticssupplanted the notion of inheritance of acquired traits, eventually leading to the development of the modern synthesis, and the general abandonment of the Lamarckian theory of evolution inbiology. Despite this abandonment, interest in Lamarckism has continued.
Studies in the field of epigenetics andsomatic hypermutation[1][2] have highlighted the possible inheritance of behavioral traits acquired by the previous generation.[3][4][5][6][7] This remains controversial as science historians have asserted that it is inaccurate to describe transgenerational epigenetic inheritance as a form of Lamarckism.[8][9][10][11]
Lamarckism (or Lamarckian inheritance) is the hypothesis that anorganism can pass on characteristics that it has acquired during its lifetime to its offspring. It is also known as theinheritance of acquired characteristicsor soft inheritance. It is named after the French biologist Jean-Baptiste Lamarck(1744–1829), who incorporated the action of soft inheritance into his evolutionary theories as a supplement to his concept of orthogenesis, a drive towards complexity. Lamarck did not originate the idea of soft inheritance, which was known from the classical eraonwards, nor was it the primary focus of his theory of evolution.
When Charles Darwin published histheory of evolution by natural selectionin On the Origin of Species (1859), he continued to give credence to what he called "use and disuse inheritance", but rejected other aspects of Lamarck's theories. Later, Mendelian geneticssupplanted the notion of inheritance of acquired traits, eventually leading to the development of the modern synthesis, and the general abandonment of the Lamarckian theory of evolution inbiology. Despite this abandonment, interest in Lamarckism has continued.
Studies in the field of epigenetics andsomatic hypermutation[1][2] have highlighted the possible inheritance of behavioral traits acquired by the previous generation.[3][4][5][6][7] This remains controversial as science historians have asserted that it is inaccurate to describe transgenerational epigenetic inheritance as a form of Lamarckism.[8][9][10][11]
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