Page 2 - 2-Lesson Notes-Accumulation of Variations, Inerited Traits

HEREDITY
The process by which the features of an organism is passed on from one generation
to another is called heredity.
• The process is done by genes, which define the characters the organism.
INHERITED TRAITS
The traits which are transmitted by the parent to its offspring during the process of
fertilization are inherited traits. This inheritance is determined by certain rules of
heredity. Inherited traits are coded in our DNA and hence can be passed on to the
next generation. Example: Eye colour, height, Complexion, Rolling of tongue,
Attached and free earlobes, Color of hair etc.

Inherited Trait Acquired Trait
Characteristic features that are inherited Traits or characteristics which develop in
from previous generation response to the environment and cannot
be inherited
Occur due to a change in genes or DNA No change in genes or DNA is involved
Pass on from one generation to another Cannot pass on from one generation to
another
E.g. Red curly hair, Brown eyes E.g. Cycling, Swimming

Mendel’s work
• Gregor Johann Mendel, known as ‘Father of Genetics’, was an Austrian Monk
who worked on Pea plants to understand the concept of heredity.
• His work laid the foundation of modern genetics.

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