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C.14 Lecture Notes

Chapter 14-1
Darwin developed a theory of Evolution

Define Key Terms:

 

Evolution

Adaptation

Descent with modification

Natural selection

 

Ideas from Darwin’s Time

Evolution: is all of the changes that have transformed life over a extremely long period of time.

Before Darwin, there were 2 ideas as to how life started on Earth:

                                1.)Species are fixed/permanent

 

                                2. )Earth was less than 10,000 years old

                                    and has remained relatively unchanged

These ideas began to change as people became aware of the diversity or organisms around them.

 

In the mid 1700’s a French scientist named G. Buffon led a study of fossils.

 

He observed that the fossils of some animals were similar to but not identical to some of the living animals.

Another French scientist,  G.B. Lamark, suggested that life changes or evolves. He recognized that species are not permanent.

 

Today scientist consider adaptation to be an inherited characteristic that improves an organisms ability to survive.

See Figure 14-1

Read p. 293

See Figure 14-2 and 14-3

Examples of adaptation

Characteristic:

A green Lizard...............Hide from predators

 

Giraffe with a long neck............able to reach top branches for food

 

Zebra Stripes............................Confuse predators

 

Bears that hibernate in the winter............... Won't need to look for food when food is scarce.

 

Assessment

 

Complete Concept Check

 

Answer in a complete sentence

 

Use a separate sheet of paper, work will be turned in after grading

 

Quiz on 14-1 Next class period

 

 

Darwin Proposed Natural Selection as the mechanism of Evolution 14.3

 


Define Key Terms

 

Population

Variation

Artificial Selection

 

Read and sum Darwin’s theory of Natural Selection:

 

---------------------------------------------------------(summarize) in your own words.

 

Artificial Selection:

Compare and Contrast Natural Selection & Artificial Selection

 

Pesticides- Natural Selection in Action (Read)

Relate pesticide resistance in insects to natural selection.

 

Assessment

Complete Concept Check

 

Answer in a complete sentence

 

You may answer on the same page as your notes

Quiz on 14-3 Next class period

      

 

 

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