no rp today. have your pencil ready and be in your seat when the bell rings
Post on 10-Dec-2015
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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.
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 Evolution1. 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?
• 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.
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3. Current evidence for evolution: (6) and (5)
A. Fossil record. Oldest fossils buried deeper. Horses evolved from a dog sized animal 60 mya
B. Phylogeny – the evolutionary history tells which species evolved from other species or had common ancestors.
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4. How do we know the phylogeny – the history of how different organisms evolved?
Phylogeny is determined . . . a.Similar body structures p. 172 G 168`b.Similar embryonic development Glencoe
169
c.Similar DNA codes
d.Vestigial structures
b. Embryonic Development
Because so many species
are so similar in their
development, it may
suggest a common
ancestor.
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.
Natural Selection• Big Five Facts ~
1. Overproduction: This refers to the way many species produce waaaay more offspring than can possibly survive.
Video clip 12:45What type of reproduction?
What is that called when the baby looks so different from the mom? Process of change?
• 3 Vocabulary words (new)
• 2 questions you still have
• 1 really good, complex or compound summary sentence of what we have learned from these notes.
Venn Diagram
• Video clip 15 min natural selection
• Compare natural selection to selective breeding (aka artificial selection)
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