Fourth Law of lamarckism or Proposition: Inheritance of Acquired Characters:
‘Body modifications or new characteristics obtained by an organism throughout its life time will automatically get transferred to the subsequent generation’.
While proposing this law, Lamarck did not give any specific illustration. He simply believed that due to circumstances prevalent in an atmosphere, an organism can employ an organ extensively and such a usage can lead to more proficient and perfect nature of that organ. Likewise, an organ not used for a longer period would worsen. Such perfect or degenerate characteristics will be inherited by following generation’s resultant in new types.
The IV Law of Lamarck had been subjected to harsh criticisms. Numerous experiments had been carried out, either to confirm or challenge this concept.
In 1890, a German Scientist, August Weismann performed few experiments with rats. He chose a set of healthy male and female rats. He started cutting their tails constantly for more than twenty generations. This experiment was executed to confirm inheritance of the acquired character that is the tailless condition. Interestingly such a situation was never observed in any of the young rats born. This finding led to the proposition of the theory that any change to the body areas (i.e., somatoplasm) will not have persuade over the reproductive cells (i.e., Germplasm). Therefore Weismann, for the initial time segregated germplasm from the somatoplasm.
This led to the formulation of ‘Germplasm theory’ that states that ‘any change to the somatoplam will not have persuaded over the germplasm’.
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