Class 10 Biology Chapter 9 | Darwinism - Heredity and Evolution

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✅ In this video,

✔️ Class: 10th
✔️ Subject: Biology
✔️ Chapter: Heredity and Evolution (Chapter 9)
✔️ Topic Name: Darwinism - Heredity and Evolution | Class 10 Science (Biology) Chapter 9
✔️ Topics Covered in This Video (By Shipra Mam): Explanation of Darwinism of Class 10 Biology Chapter Heredity and Evolution
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00:00 Introduction: Heredity and Evolution
00:05 Darwinism
23:16 Website Overview
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Darwinism:
Inheritance of the characters according to darwin.

Charles Darwin set out on a voyage when he was 22 years old.

He travelled by HMS Beagle ship.

He visited many islands of South America, South Africa, Australia and Galapagos Islands.

Name of his is book origin of species. The theory presented by him is called theory of natural selection or Darwinism.

Facts
Enormous rate of reproduction among animals.
Constant number of animals of a species.

Struggle for existence
Heritable variations

Survival of the fittest
Continues environment changes

Charles Darwin explained the mechanism of origin of new species by natural selection.

But he failed to explain the mechanism of source of heritable variations.

This was explained by Hugo de Varies a dutch botanist.

According to him heritable variations variations arise when there is a change in genes of the germplasm (protoplasm of germ cell).

He called it mutation.

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