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Evolution and Classification - Introduction

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Heredity refers to the passing of traits or characteristics through genes from one generation (parent) to the other generation (offspring). This heredity is very evidently seen in sexual reproduction, as the variation of characteristics that are inherited is high.

During the sexual reproduction process, variation occurs due to some error in DNA copying. Variation is important because it contributes to evolution and forms the basis of heredity. variation is caused due to positive gene mutations, the interaction of genes with the environment and various combinations of genetic material. Remember that variation can occur through asexual reproduction process too. But these variations are not very noticeable.

 

Types of variation:-

-Variation are of two types:

(i) Somatic Variation

-It is also known as acquired traits.

-It is neither inherited nor transmitted

-It takes place in the body cell

 

(ii)Gametic Variation

-Also known as inherited traits

-Inherited as well as transmitted

-Takes place in the gametes/reproductive cells.

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Heredity and Evolution Part 1 [00:12:00]
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