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6.Evolution

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Darwin's theory of natural selection to explain organic evolution was based on

A

Modifications in organs through use and disuse

B

Prodigality of reproduction, struggle of existence and survival of fittest

C

Inheritance of acquired characters

D

Appearance of sudden large variations, their inheritance and survival of those having these variations

Solution

It's Obvious

Std 12

Biology

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$^{\prime} XX ^{\prime}$ is a type of selection process in evolution $^{\prime} XX ^{\prime}$ promotes the population changes in one particular direction $^{\prime} XX ^{\prime}$ favours small or large sized individuals, mean size of population changes in $^{\prime} XX ^{\prime}$. Identify $^{\prime} XX^{\prime}$

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Write short note on Hardy – Weinberg principle.

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Which is basis of evolution

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Factor affecting the Hardy-Weinberg principlesare

$(I)$ Gene flow ;

$(II)$ Genetic drift

$(III)$ Mutation

$(IV)$ Genetic recombination

$(V)$ Natural selection

The correct combination is

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Organic evolution would have not been taken place

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