Question

I want notes of heredity and evolution of std 10​

Answer 1

Answer:

evolution

evolution is a slow and and continuous processwhere by complex forms of life have emergex from simplier forms through millions of years.

heridity

it is transmission of genitically based characteristics from parents to off spring.

Answer 2

Answer:

I will give you notes of chapter heredity and evolution..

Heredity and evolution

The study of heredity and variation is known as genetics. Heredity is defined as transmission of characteristics from parents to offspring’s. The differences in characters of parents and offspring’s is known as variation.

There are two types of variation- somatic variation and gametic variation.

Somatic variation occurs in the somatic cell of the body. They are not inherited or transmitted in the next generation. So, they are also known as acquired traits.

Gametic variation occurs in the germ cells of the body. They are inherited in the next generation. So, they are known as inherited traits. (NTSE)

Importance of variations

It is the basis of the heredity.

It is the basis of the evolution also.

It increases the chances of the survival of the organism according to the changing environment.

Causes of variation

The most common causes of variations are mutation, recombination and random mating. Recombination or crossing over is one of the important reason for variation. It is a exchange of chromosome segment at the time of gamete formation.

Mendel and his contribution in Genetics

G.J. Mendel started his work on Pisum sativum (garden pea). He was known as Father of genetics. He had chosen seven pair of contrasting character-

NTSE

(NTSE)

The reason of choosing garden pea for experiment was-

Short life cycle

Large number of seeds produced

Self-pollination

Several contrasting characters can be found (NTSE)

Mendel Laws

Law of Dominance: If the two alleles at a locus differ, then one, the dominant allele, determines the organism’s appearance; the other, the recessive allele, has no noticeable effect on the organism’s appearance.

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