heredity

Variations and its types

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The differences that are found between the individuals of same species are called variation. It is very difficult to find out two individuals exactly similar in the nature. It may be harmful, useless and useful. Harmful or useless variations make individuals unfit for struggle for existence, whereas the useful variations are quite significant and make … Read more

Darwin’s theory of evolution (Theory of Natural Selection)

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It is also known as theory of natural selection. Charles Robert Darwin was (1809- 1882) an English naturalist published his famous book “ The origin of species by natural selection” in 1859. This theory is based on a mass of accurate observations and prolonged experiments. This theory led the whole scientific world to believe in … Read more