4 Biologybasics biology evolution

 BIOLOGICAL EVOLUTION

1. Any genetic change in a population that is inherited over several generation is Known as Biologicals evolution.

Micro evolution : A change in the genetic level of a population is denied as a small scale change and is called Micro- evolution.

Macro evolution : Biological evolution also includes the idea that all of life is connected and can be traced back to one common ancestor. This is called Macro evolution.


Evidence from Connecting Links

The organisms having the structures of two different groups are called connecting links

Theory of Carolus Linnaeus:

(i) Theory of Carolus Linnaeus :

Carolus Linnaeus (1707 - 1778) contribution to classification provides an evoluaitionalry Relationships among the organisms.

No spices is new. He believes that each nard every specie originates from some pre- exiting species.

(ii) Theory of Lamarck or Lamarckism:

Jean Baptiste de Lamarck (1744 - 1829) in 18012 and 1809 Proposed this theory that is organism undergo changes for adapting themselves to environment and the characters thus acquires are passed on to the next generation.

Lamarckism theory is popularly called theory of inheritance of acquired characters.

Lamarck's book was Philosophic Zoologies.

(iii) Theory of Darwin or Darwinism:

It is the theory of the evolution of species by natural selection.

This theory was proposed by Charles Darwin in his book on the origin of species in 1859. 

Darwinism is popularly Known as Theory of Natural selection.


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