CHAPTER - 9
HEREDITY AND EVOLUTION
Class X
Subject Science
Subject Teacher Dr. Reema Gupta, PGT-Biotech
School KANKARBAGH (FS)
,la) Heredity
The transfer of characters or traits from the parents to their
offsprings is called heredity.
b) Variations
The differences between the characters or traits among the
individuals of the same species are called variations.
, 2) Accumulation of variations during reproduction
When organisms reproduce, the offsprings show minor
variations due to inaccuracies in DNA copying. These
variations are less in asexual reproduction and more in
sexual reproduction.
Some variations are useful variations and they help the
organism to adjust to the changes in the environment. Some
variations do not help the organism to adjust to the changes
in the environment and they may die and become extinct.
HEREDITY AND EVOLUTION
Class X
Subject Science
Subject Teacher Dr. Reema Gupta, PGT-Biotech
School KANKARBAGH (FS)
,la) Heredity
The transfer of characters or traits from the parents to their
offsprings is called heredity.
b) Variations
The differences between the characters or traits among the
individuals of the same species are called variations.
, 2) Accumulation of variations during reproduction
When organisms reproduce, the offsprings show minor
variations due to inaccuracies in DNA copying. These
variations are less in asexual reproduction and more in
sexual reproduction.
Some variations are useful variations and they help the
organism to adjust to the changes in the environment. Some
variations do not help the organism to adjust to the changes
in the environment and they may die and become extinct.
