Speciation and Origin of Life

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Speciation

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The formation of new and distinct species in the course of evolution.

Tags

NGSS.HS-LS3-2

NGSS.HS-LS4-1

NGSS.HS-LS4-2

NGSS.HS-LS4-4

Front

prezygotic isolation mechanism

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a barrier to successful breeding that occurs before fertilization, such as differences in mating time or behavior

Front

Postzygotic isolation mechanism

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offspring of mating between members of different species do not survive or reproducepost

Tags

NGSS.HS-LS4-2

Front

Allopatric speciation

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The formation of new species in populations that are geographically isolated from one another.

Front

adaptive radiation

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evolution from a common ancestor of many species adapted to their diverse environments

Tags

NGSS.HS-LS4-1

NGSS.HS-LS4-2

NGSS.HS-LS4-4

Front

Sympatric speciation

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The formation of new species in populations that live in the same geographic area.s

Tags

NGSS.HS-LS4-2

NGSS.HS-LS4-4

Front

Gradualism

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slow steady change over time

Tags

NGSS.HS-LS4-1

NGSS.HS-LS4-2

NGSS.HS-LS4-4

NGSS.HS-LS4-5

Front

Punctuated equilibrium

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abrupt or fast change over time followed by no change.

Tags

NGSS.HS-LS4-1

NGSS.HS-LS4-4

NGSS.HS-LS4-5

Front

Spontaneous generation

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the hypothesis idea that living things can arise from nonliving sources

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theory of biogenesis

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states that only living organisms can produce other living organisms