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Natural Selection

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by

Leeloo Gilet

on 1 February 2013

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Transcript of Natural Selection

Definition a natural process that results in the survival and reproductive success of individuals or groups best adjusted to their environment, that leads to the perpetuation of genetic qualities best suited to that particular environment Charles Darwin Natural Selection The animals (or plants) best suited to their environment are more likely to survive and reproduce, passing on the characteristics which helped them survive to their offspring. Gradually, the species changes over time. Evolutionary Genetics By: Leeloo Gilet, Adriana Knight, Sophia Salzer, and Devyn Zaminski Learning Outcome:
Students will develop an understanding of natural selection and, more specifically, how species evolve from generation to generation. 1809 - 1882 Darwin's Finches: The Warrior Ant Each beak adapted to be perfect for eating that specie’s particular food.
This helped Darwin figure out that animals must adapt to better suit their environment. The Peppered Moth: Industrial Revolution:
white buildings and trees were turned black from soot in air
whitish moths no longer camouflaged
birds ate lighter moths and the black moths became more common capable of emitting chemical signals to justify what colony they are part of
clever enough to understand that they could mock other scents
to control another colony, they emit chemical and go undetected until they overthrow the old leader more pesticide more likely that insects will develop immunity
happens quickly (1 generation)
offspring will be resistant to the pesticide from birth
those that are not immune will die, while the strongest will survive The Peacock more impressive male tail more likely that it will mate
females choose males based on
color- brighter = higher quality genes
the physical size and shape- the overall look
males without bright tails less likely to mate and reproduce. As a result:
the number of males goes down every generation
this is why they are rare Inbreeding Via Pollination Via Reproduction Inbreeding Depression Recessive Genes How Genes are Passed Lack of Immunity
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