Evolution

What is Evolution?

Evolution is the change in the inherited characteristics of biological populations over successive generations. Evolutionary processes give rise to diversity at every level of biological organization, including species, individual organisms and molecules such as DNA and proteins.

Evidences for Evolution

Theory of Special Creation

Theory of Spontaneous Generation

Theories of Transmutation or Evolution

Jean Baptiste de Lamarck Theory

Theory of Use and Disuse

Theory of Need

Theory of Inheritance of Acquired Characteristics

1. Theory of Use and Disuse

• The vegetation on that time was almost consumed• the giraffe needs to stretch its neck to reach those leaves on the trees.• Their neck often led to the development of long necks due to its need to reach for more food• Since the giraffe are already long-necked, they will probably give riser to long-necked giraffes

2. Theory of Need

• Observed on the changes in the body shape of a snake.• Changes in land formation occurred and snakes had to pass through narrow places• The snake had to crawl because of its need and later on transformed the body of the snake to an elongated form.

3. Theory of Inheritance Acquired Characteristics

• The traits and characteristics were passed on its offspring.

• The characteristics are being inherited by the present form species.

August Weisman

• He wanted to test Lamarck’s Theory on the Inheritance of Acquired Characteristics• He cut the tail of the mouse and mated it with a long-tailed mouse.• He repeated the experiment for 22 generations. • On the 21st generation, all the mice had long tails. this experiment disproved the theory of Lamarck

The works of Lamarck did not gain any support because:

It did not show the real meaning of Transmutation

It did not show the real meaning of Speciation

The Theories did not account Biodiversity

Charles Darwin theory of Evolution

The Theory of NATURAL SELECTION