History of Evolutionary Thought. Engage. Can you tell a chicken from a fish? A human from a turtle? http://www.pbs.org/wgbh/nova/beta/evolution/guess-embryo.html Sure you can…complete “Timing is everything” activity
What happened in 30-50 MY’s?
Darwin returned 5 years later in 1836
How did the finch speciation occur? What environmental, genetic, physical changes took place?
Sure you can…complete “Timing is everything” activity
2. genetic, physical changes took place?DNA
by comparing the DNA sequencesof two organisms or the amino acid sequences made from the DNA, scientists can learn which organisms are related; the more DNA two organisms have in common, the closer related they are
Using the table, compare the amino acid sequence of the chimp and the human.
Notice that for this protein the chimp and human have the exact same sequence.
Now compare the baboon and the human.
Notice that there are 5 differences in the sequence.
This tells you that the human is more closely related to the chimp than the baboon.
1: GGC ATG TTA chimp and the human.
2. GGC GTT TTA
3. GGC TCT TTA
ex: whales, cats and birds all have the same # and type of bones in the forelimbs but their functions are different