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Evolution
Evolution

... His evidence for this process could be found in the fossil records, geographical distribution of species, homologous structures of living organisms and embryology. ...
Population Genetics
Population Genetics

... How populations change over time ...
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... Describe the tools available to researchers for learning the evolutionary history of life. ...
Aim 45 BLANK - Manhasset Schools
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...  Erasmus Darwin: proposed that all living things came from a common ancestor  Lamarck: said changes in the environment could change an organism’s behavior and thus change its genetics ...
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...  That adaptation becomes more common in the next generation of offspring ...
Evolution
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Natural Selection and Origin of Species (Outline) • Evolution as core
Natural Selection and Origin of Species (Outline) • Evolution as core

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7 th Grade Life Science Evolution Study Guide

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... Theory of acquired traits: Lamarck said Organisms acquire or lose certain traits during their lifetime by use or disuse. These traits could then be passed on to offspring. Over time this would cause change in a species Example: The giraffe’s neck growing longer to reach the food on taller trees. Who ...
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Chapter 6 Changes Over Time STUDY NOTES

... A species is a group of similar organisms that can mate with each other and produce fertile offspring. Adaptation, a trait that helps an organism survive and reproduce. Darwin reasoned that plants or animals that arrived on the Galápagos Islands faced conditions that were different from those on the ...
Nature of Science and Evolution Powerpoint
Nature of Science and Evolution Powerpoint

... The format for writing a hypothesis “IF . . . THEN . . .because….” Example : If we increase the temperature of the fish’s water, then the breathing rate will increase because breathing rate is dependent upon temperature. ...
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The Modern Theory of Evolution

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Evolution Unit Name: Study Guide ___ Evolution ___ Extinct ___

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Evolution
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15-1 The Puzzle of Life`s Diversity
15-1 The Puzzle of Life`s Diversity

... Unit 10 (Chapters 14-15) ...
< 1 ... 146 147 148 149 150 151 152 153 154 ... 174 >

Punctuated equilibrium



Punctuated equilibrium (also called punctuated equilibria) is a theory in evolutionary biology which proposes that once species appear in the fossil record they will become stable, showing little net evolutionary change for most of their geological history. This state is called stasis. When significant evolutionary change occurs, the theory proposes that it is generally restricted to rare and geologically rapid events of branching speciation called cladogenesis. Cladogenesis is the process by which a species splits into two distinct species, rather than one species gradually transforming into another. Punctuated equilibrium is commonly contrasted against phyletic gradualism, the belief that evolution generally occurs uniformly and by the steady and gradual transformation of whole lineages (called anagenesis). In this view, evolution is seen as generally smooth and continuous.In 1972, paleontologists Niles Eldredge and Stephen Jay Gould published a landmark paper developing their theory and called it punctuated equilibria. Their paper built upon Ernst Mayr's model of geographic speciation, I. Michael Lerner's theories of developmental and genetic homeostasis, as well as their own empirical research. Eldredge and Gould proposed that the degree of gradualism commonly attributed to Charles Darwin is virtually nonexistent in the fossil record, and that stasis dominates the history of most fossil species.
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