Evolution 1
Presentation
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Biology
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9th - 12th Grade
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Medium
+4
Standards-aligned
Karla Test Account
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15 Slides • 7 Questions
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Evolution 1
Students will be able to understand that evolution is the result of small changes over time.
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What is evolution?
the change in the characteristics of a species over several generations and relies on the process of natural selection.
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Multiple Choice
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Multiple Choice
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Multiple Choice
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Evolution of organisms is like the evolution of language
Each generation changes slightly
Big changes happen slowly over time
Words that are no longer useful are dropped
The transfer of language happens between different populations creating mutations and variation
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Multiple Select
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Open Ended
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Aristotle
350BC
First classification system for animals
2 main groups - With blood / without blood
Thought that humans were at the top of the hierarchy of animals
Gave organisms 2 names (binomial nomenclature)
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Carl Linnaeus
1735
Created a simplified and uniformed naming system for animals and plants (Taxonomy)
Used Latin to name oranisms (common language)
by 1758 4400 animals and 7700 plants were classified
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How would you classify this animal? It lays eggs, has a beak, is warm-blooded, and has mammary glands
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Poll
How would you classify this animal?
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Platypus
An egg laying mammal that nurses it's young through mammary glands.
“Of all the Mammalia yet know, it seems the most extraordinary in its conformation; exhibiting the perfect resemblance of the beak of a duck engrafted on the head of a quadruped.” George Shaw in 1799
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Platypus fun facts
They are only found in Australia
Have a cloacas more commonly found in birds, reptiles, and amphbians
Their chromosomes resemble that of a birds instead of a mammal
Have a skeletal build like a reptile
Have venom like reptiles
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Open Ended
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Evidence for Evolution
Molecular Evolution - Looking at the DNA
Common ancestry - Looking at organisms that have similar features
Fossil records
Comparative anatomy - structures
Developmental Evidence - how does it grow?
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Using Molecular DNA to look back in time
Changes in DNA can help us understand how organisms changed over time.
The more DNA 2 organisms share, the closer related they are to each other
The ancestor of monotremes branched off from the rest of the mammals between 160 and 210 million years ago according to molecular studies.
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Fossil Records
Bones or tracks left behind by extinct organisms
Can help us trace organisms through time and find common ancestors
In 1992 a fossil of a cousin of the platypus was found in Argentina (paleocene period 60million years ago)
Evolution 1
Students will be able to understand that evolution is the result of small changes over time.
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