DNA and Evolution

What are some Lines of Evidence for Evolution??

• Fossils/Radiometric Dating• Structural Similarities• Geographical Distribution• Embryological/Developmental Similarities• Direct Observations (antibiotic resistance)• Molecular Similarities……DNA!!!!!

• Is a CAT more closely related to a TIGER or a BEAR??

• Is a CAT more closely related to a BEAR or to an EAGLE?

• What did you base your answers on?

• Is a CAT more related to a LION or a TIGER???

DNA and Evolution

Investigative Question: How do similarities in the DNA of different organisms show evolutionary relationships?

Copy Fig. 8.20 on p. 442 into your notebook. 1. Which 2 organisms appear to be the most closely related? What

is your evidence? Read the 2 paragraphs at the top of p. 443. (see next slide) 2. Use Fig 8.20 to form an opinion on these 2 theories of

primate evolution. Which theory do you think is more accurate based on DNA evidence? Justify your answer.

Complete R & C q’s 1-4. (see next to last slide)

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DNA and Evolution