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S7L5 Students will examine the evolution of living organisms through inherited characteristics that promote survival of organisms and the survival of successive generations of their offspring. .

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slide1

S7L5 Students will examine the evolution of living organisms through inherited characteristics thatpromote survival of organisms and the survival of successive generations of their offspring.

S7L5.a Explain how physical characteristics of organisms have changed over successive generations (e.g. Darwin’s finches and the peppered moths of Manchester).

S7L5.b Describe ways in which species on earth have evolved due to natural selection.

S7L5.c Explain how the fossil record found in sedimentary

rock provides evidence for the long history of changing

life forms.

Meet Darwin

evidence for evolution
Evidence for Evolution
  • In 1831 Charles Darwin traveled around the world. In the Galapagos Islands he observed a great variety of organisms like finches p.175, tortoises and iguanas.
who was charles darwin
Who was Charles Darwin?
  • Darwin had begun to think that species could evolve over time. It became clear to Darwin that Earth was much older than anyone had imagined.
  • What Is a Species? A species is a group of organisms that can mate with one another to produce fertile offspring. A characteristic that helps an organism survive and reproduce in its environment is called an adaptation.
slide5
2. The evidence Darwin collected led him to theorize that living things change over time or evolve.
slide6
3. Current evidence for evolution:(6) and (5)
  • Fossil record. Oldest fossils buried deeper. Horses evolved from a dog sized animal 60mya
slide7
B. Phylogeny – the evolutionary history tells which species evolved from other species or had common ancestors.
4 how do we know the phylogeny the history of how different organisms evolved
4. How do we know the phylogeny – the history of how different organisms evolved?

Phylogeny is determined . . .

  • Similar body structures `
  • Similar embryonic development
  • Similar DNA codes
  • Unnecessary body structures
b embryonic development
b. Embryonic Development

Because so many species

are so similar in their

development, it may

suggest a common

ancestor.

d vestigial structures
d. Vestigial structures

Some species have structures that they do not need. For example,

humans ~ appendix

whales ~ tiny hip bones that whales do

not need may have been inherited

from their walking ancestors.

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5. What is Natural Selection? Evolution occurs because of Natural Selection – organism that is better adapted lives longer and produces more offspring.

another way to say it
Another way to say it . . .
  • Natural Selection ~ the critters that are better equipped for survival have a better chance of…(you tell me)?
natural selection
Natural Selection
  • Big Five Facts ~
  • Overproduction: This refers to the way many species produce waaaay more offspring than can possibly survive.
and those individuals that survive reproduce and pass on those advantages through their genes
And those individuals that survive reproduce and pass on those advantages through their genes.
darwin did he act alone
Darwin…did he act alone?
  • Well…he did but there was another dude acting alone at the same time…Alfred Russel (don’t call me Russell) Wallace.
  • Wallace was an admirer of Darwin and texted him to say that he figured out the whole natural selection thing.
  • And then Darwin was all like…oh no you didn’t 
  • Yes…he did!

This slide from Hightower

venn diagram
Venn Diagram
  • Compare natural selection to selective breeding (aka artificial selection)
ecology review
Ecology Review
  • ..\CRCT\Ecology Review.ppt
holt review games
Holt Review Games
  • Genetics..\..\..\McDougal and review game\Review Game\rg_L_4 genetics.html
  • ..\..\..\McDougal and review game\Review Game\rg_L_5 genetics.html
  • Evolution ..\..\..\McDougal and review game\Review Game\rg_L_6 evolutio.html
brain pop
Brain Pop
  • http://www.brainpop.com/