Explanation

I, II, III, IV and V. Modern Concept of Evolution Modern concept of evolution is the synthesis of Darwin’s and Hugo de Vries theory also called synthetic theory of evolution. Modern concept of evolution includes the following steps (i) Genetic variations in population (ii) Isolation (iii) Heredity (iv) Natural selection (v) Speciation (origin of new species) The modern theory is a result of number of scientist namely T Dobzhonsky, RA Fisher, JBS Haldane, Sewall Wright Ernst Mayer, GL Stebbins Stebbins in his book ‘Progress of organic evolution’ discussed the synthesis theory of evolution