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A man steps on a group of beetles killing most the green ones and not a single brown. After a while no green beetles will be left.

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A seed getting blown to new land

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When there are two areas of trees and one of the areas caught on fire.

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Northern elephant seals have reduced genetic variation most likely due to being hunted!

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Earthquake kills all the white flowers in a population of white, red, and yellow flowers, then there will be only red and yellow flowers.

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Red ladybugs

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Northern elephant seals have reduced genetic variation most likely due to being hunted

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Cheetas have a very small number of alleles in the Gene pool.caused by bottleneck affect during the last ice age.

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A tsunami wipes out red birds on lower trees by chance while the blue birds in high trees survive by chance.

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Population bottlenecks occur when a populations size is reduced by one generation
Northern elephant seals had reduced number of genetic variation due to being hunted

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A green eyed person dies leaving all brown and blue eyed people

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reduced genetic variation from the original population .

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Northern elephant seals have reduced genetic variation most likely due to being hunted

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When blue flowers seeds are the only ones found on an island.

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Red ladybugs are blown to an island from a population of red and yellow ladybugs.Making a population of all red.

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When part of a population moves to a different place and grows differently when introduced to another climate area.

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is a sharp reduction in the size of population due to environmental events

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Northern elephant seals have reduced genetic variation from being hunted. Hunting reduced the population to 20 individuals by the 19th century.

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Someone depoting a flower than planting it somewhere else

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When a seed from one area gets blown into a new area by the wind and starts a new population somewhere else

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Northern elephants seals have reduced genetic variation most likely due to being hunted. Hunting reduced their population size to as few as 20 individuals at the end if the 19th century.