Darwin and Evolution Irelyn anderson

Evolution

Darwin

THE STRUGGLE FOR EXSISTANCE

If more individuals are produced than can survive, members of a population must compete to obtain food, limited space, and other necessities of life.

Survival

VARIATION AND ADAPTATION

Any inheritable characteristic that increases an organisms ability to survive and reproduce in its environment.

Adaptation

SURVIVAL OF THE FITTEST

According to Darwin, differences in adaptations affect an individuals fitness. Fitness describes how well an organism can survive and reproduce its environment.

Survival

NATURAL SELECTION

Natural selection occurs in any situation in which more individuals are born than can survive, there is natural heritable variation, and there is a variation fitness among individuals.

Natural selection

EVIDENCE OF EVOLUTION

Light and dark butterflies in different climates

ANALOGOUS STRUCTURES

A birds wing and a horses front limb have different functions but similar structures.

Different structures

VESTIGIAL STRUCTURES

They see inherited from ancestors but have lost all of there functions due to different selection pressures acting on the organism.

Ancestors

EMBRYOLOGY

Researchers noticed that early developmental stages of many animals with backbones look very similar. The same groups of embryonic cells develop in the same order and patterns to produce the homologous tissues in organisms.

Backbones animals

LIFES COMMON GENETIC CODE

Evolution is so basic that by this point the study of evolution might take it for granted. All living cells use DNA and RNA to carry information from one generation to another to direct protein synthesis.

DNA and RNA

Credits:

Created with images by WikiImages - "charles robert darwin scientists naturalist" • bogdanchr - "nature insect butterfly" • magee - "butterfly wings insect" • watts_photos - "seagulls birds" • Alexas_Fotos - "horse animal ride" • jkavo - "Ancestors" • Fisherprice - "tree millennium forest" • James St. John - "Mammut americanum (American mastodon) (Pleistocene; Aucilla River, Jefferson County, Florida, USA) 16" • James St. John - "Mammut americanum (American mastodon) (Pleistocene; Aucilla River, Jefferson County, Florida, USA) 4" • mknowles - "Lego DNA" • artursfoto - "modified tomato genetically"

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