Question

What Is Lamarckism??

Answer 1

HEYAA FOLK,

A theory of organic evolution asserting that environmental changes cause structural changes in animals and plants that are transmitted to offspring is called Lamarckism....


Hope it helps you!!!

Answer 2

$\bold{\Large\purple{\boxed{{{Hey \: Mate..!!}}}}} \\ \\ </p><p>\bold{\Huge\red{\boxed{{{Answer}}}}}$

✒ Lamarckism

• Lamarckism was proposed by Jean-Baptiste de Monet Lamarck in the year 1744-1829.
• This theory was based on the principle that all the physical changes occurring in an individual during its lifetime are inherited by its offspring.
• For eg, the development of an organ when used many times.
• This theory has been explained here.

-----------------------------------------

✒ Lamarck’s Theory

☞Lamarck’s theory includes four main propositions :-

1. Change Through Use And Disuse

• The organs which are used frequently by the organism develop and the characteristics that are used seldom are lost in the succeeding generations.

2. Organisms Driven To Greater Complexity

• As the organisms adapted to their surroundings, they became increasingly complex from the simpler forms.
• Lamarck believed in the spontaneous generation of life.

3. Inheritance of Acquired Characters

• An individual acquires certain characteristics during its lifetime.
• These characters are inherited by their offspring as well.
• He explained this with an example of a blacksmith.

4. Effect of Environment and New Needs

• The environment influences all the organisms.
• A slight change in the environment brings about changes in the organisms.

-----------------------------------------

✒ Examples of Lamarckism

☞ Few of the examples of Lamarckism are mentioned below :-

1. Evolution of giraffe
2. Cave Dwellers
3. Flightless Birds
4. Extinction of Limbs in Snakes
5. Aquatic Birds with Webbed Toes

-----------------------------------------

$\blue{\boxed{\boxed{\boxed{5 \:Thanks +Follow =Inbox}}}}$