some important notes of heredity and evolution
Answers
Answer:
in heredity changes occur over species
and in evolution there is inherent change from there parents which are sightly different from us
Answer:
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.