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Punctuated Equilibrium vs. Gradualism

Bellringer: Science News!

Review

Primates continued...

1. 6-8 million years ago chimps and hominids split.

2. Hominids appeared about 4 to 6 million years ago and had larger brains than apes

III. The Evolution of Primates

A. Primates-

  • What is a primate?
  • What are some similarities between primates?

Group of mammals with opposable thumbs, binocular vision, and flexible shoulders

Punctuated equilibrium

Reading

Punctuated equilibrium is...

Homo sapiens

B. Homo sapiens appear about 100,000 years ago.

1. Cro-Magnon fossils date from around 10,000 to 40,000 years ago; Cro-Magnon humans are thought to be direct ancestors of early Homo sapiens.

A model explaining the speed of evolution that suggests gene mutation can result in a new species in a relatively short time.

  • But what does that mean?
  • How are the examples of Punctuated equilibrium different than gradualism?
  • Did Darwin believe in punctuated equilibrium?
  • Do you believe in punctuated equilibrium or gradualism?

The End

Tomorrow

Start the Lab

Tomorrow We have a new lab

  • We will be examining primate adaptations
  • if you can wear a sweater with buttons or a zipper
  • Answer questions on a blank piece of paper we will trade and grade.
  • A dark lizard and a white lizard live in a desert with dark soil. The dark lizards survive very well and in fact live to reproduce. The white lizards get eaten by the hawks. This is an example of what?
  • A _________ that make an organism better suited to its environment is an adaptation.
  • A bird's wing and your arm with similar bone structures are examples of __________ __________.
  • The process that forced Pangea into other continents is called what?

Vocabulary time

Gradualism: Describe evolution as a slow, ongoing process over millions of years.

Now turn in your homework before I forget!

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