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Darwin's Theory of Evolution (Everyone is different (It is the gradual…
Darwin's Theory of Evolution
The two general ideas of Darwin’s Theory are
Evolution
Natural Selection
Natural Selection
heritable variations exist within a species
Species produce more offspring than can survive.
Offspring with favorable variations are more likely to survive and reproduce.
Gradually, individuals with favorable variations make up more of the population.
means that all existing species are related by “common ancestry.”
Common ancestry explains the similarities among present-day species and natural selection in the face of environmental change explains the differences among present-day species
This differential survival and reproduction results in a population which is adapted to its environment.
natural selection is gradual change in species and when enough changes have accumulated, new species form. This is “descent with modification.”
Theory of Evolution
His explanation of how species naturally change over time
natural selection
.
Everyone is different
mutations in DNA can change genes and produce variations in trait
recognized that sexual reproduction increased variety in offspring
that most populations remained stable due to environmental limits.
"Differential survival and reproduction" is a cornerstone of natural selection.
Survival to the fittest
It is the gradual accumulation of many adaptations
over many generations within one lineage of organisms, results in a new species
Through chance variation
Overproduction of offspring
differential survival and reproduction
the proportion of individuals with a favorable trait
Natural selection is not directed or intentional
Variation among individuals within species ensures that some will survive environmental change
Cause some variations help survival in a specific habitat more than others, individuals having those variations are more likely to survive and reproduce.
natural selection has led to the origin of all species, together with evidence from the fossil record,
means that all existing species are related by “common ancestry.”