scenario: there are 3 types of polar bears: ones with thick coats, ones with thin coats, and ones...
TRANSCRIPT
Scenario: There are 3 types of polar bears: ones with thick coats, ones with thin coats, and ones with medium coats. It is fall, soon to be winter. The temperatures are dropping rapidly and the bears must be kept warm, otherwise they will freeze to death. Many of the bears have had 2 cubs each, but due to the extreme temperatures, many mothers only have one cub left.
Which bear did you think was most likely to survive?
Which bear did you think was most likely to survive?If the bears with
thick fur were the ones that survived – which bears are most likely to reproduce and pass on their genes to the next generation?
If the bears with thick fur were the ones that survived – which bears are most likely to reproduce and pass on their genes to the next generation?
What determines which species survive and which do not?
Evolution – The change in Evolution – The change in inherited inherited traits traits of a population over time, is of a population over time, is one one theory theory that explains how living that explains how living things that appear to be different are things that appear to be different are relatedrelated
First scientist to describe evolution
Believed that traits developed by a parent over time could be passed on to their offspring
Example: If a person was to practice running faster and faster, that person’s child would be born a fast runner
However, he was wrong!
- Charles Darwin-the father of evolutionary theory
- Sailed around the world studying finches (birds)
- Proposed that all organisms evolved from just one or two different organisms, millions of years ago!
- These older organisms spread out to different areas, and in their new areas, changed (evolved) to fit different ways of life.
Natural Selection: the process by which individuals that are better adapted to their environment are more likely to survive.
The species then reproduce and pass those successful variations (genes) to the next generation.
Adaptation: any trait that helps the chances of survival and reproduction
Structural Adaptations: - Some structural adaptations are
used for defense against predators
Examples:Thorns in plantsSpines in animals
Other forms of structural adaptations-- Mimicry – provides protection
by an organism copying the appearance of another species.
-- Camouflage – allows for organism to blend with its environment
If you were a bird….which of these moths would be easier for you to eat?
If you were a bird….which of these moths would be easier for you to eat?
D.N.A