Lock-In 10/4 Gradualism and Punctuated Equilibrium

The idea that evolution seems to occur in spurts of time.

• stabilizing selection
• gradualism

• disruptive selection
• puntuated equilibrium

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112.34.c.7.B

The idea that evolution happens with the accumulation of gradual changes in the population over time.

• stabilizing selection
• gradualism

• disruptive selection
• puntuated equilibrium

Tags

112.34.c.7.B

Analyze the following Phylogenetic Tree: What characteristic is shared by Mammals, Reptiles, Birds, and Amphibians?

(a)  

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NGSS.HS-LS4-1

Humans are causing extiction in which ways?

• By over hunting animals for food or products.
• By destroying the natural habitat of species.
• By polluting the environments of the world.
• All of the above.

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112.34.c.7.B

The hypothesis that the evolution of a species occurs in periods of rapid change separated by periods of little or no change is called:

​ (a)  

• Divergence
• Gradualism
• Isolation
• Punctuated Equilibrium

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112.34.c.7.B

Which organisms pictured on the cladogram have hair?

• prosimians only
• prosimians and humans
• humans only
• prosimians and birds

Suggests that evolution occurs at a slow-but-steady pace. (a)  

• Transformational theory
• Theory of natural selection
• Punctuated equilibrium
• Gradualism

Answer explanation

SLOW but STEADY, like a turtle.

This theory explain that evolution, or change, happens VERY SLOWLY over a LONG TIME.

It happens GRADUALLY.

Proposes that species are stable most of the time, but every now and then there is a disruptive event that prompt rapid change. (a)  

• Transformational theory
• Theory of natural selection
• Punctuated equilibrium
• Gradualism

Answer explanation

SHORT burst of SPEED like a rabbit.

This theory say that evolution, or change, happens VERY FAST in between LONG PERIODS of NO CHANGE.

Usually forced by major change in the environment.

Tags

NGSS.HS-LS4-5

What is the difference between gradualism and punctuated equilibria?

• Gradualism is slowly but surely and P.E. are rapid changes preceeded followed by long periods of little or no change
• P.E. is slowly but surely and Gradualism are rapid changes preceeded followed by long periods of little or no change
• Gradualism had no intermediate forms of species
• punctuated equilibria has intermediate forms of species

What is the most correct definition of evolution?

• Change over time. 
• Animals changing over time. 
• Organisms changing over time.
• Species changing over time. 

Tags

112.34.c.7.B