Evolution Theories

Theories abot evolution explain the transformations that species suffer from one generation to another

Neo-Darwinism or synthetic theory of evolution

Lamarckism or impresination

Darwinism or evolution by natural selection

  • Conditions of the enviroment change and generate new needs.

This theory is summarized in the following points

Examples:

  • The organs most used develop more, and the least used atrophy or can even disappear.
  • The acquired modifications are trasmitted to their offspring and favor the origin of a new species
  • The individuals that have more beneficial variations, survive and produce more descendants.
  • The natural selection acts over the species and has beneficial variations causing them to change continuously and to originate a new species.

Darwinism is summarized in the following way

  • The adaptation to an enviroment is produced in the course of time and leaves as a result, a population which is better prepared to survive in the enviroment

)

image

image

Giraffes

Horses

)

Examples:

image

Finches

Snails

image

Examples:

image

image


Beetles

Peppered Moth

  • The individuals generate as many desendants as possible

some of the tenets are:

  • These are inherited changes produced in the genetic meterial and give place to differentiation among individuals.

The evolution of a species occurs over a long time and many generations

They generate new capacities according to the needs of the environment where they live.