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Process of Natural
Selection Foldable
Natural Selection = NS
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NS – individuals better adapted to their environment survive and reproduce more successfully than less well-adapted organisms do.
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Overproduction
egg sac
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• Overproduction: organisms in a population produce more offspring than their environment can support.
Many die through predation or starvation
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Example:• Tarantula’s egg sac holds 500 to 1,000 eggs. • Some eggs survive and develop into adult spiders and some die.
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Photography of Egg sack - Poecilotheria pederseni
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The moulting process
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Genetic Variation Within A Population
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• Variation: Differences in a population of organisms of the same species.Variations/Genetic Adaptations - passed to offspring from parents through genes/alleles.
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Example:• Every individual has its own combination of traits. • Each tarantula is similar, but not identical, to its parents.
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Struggle to Survive
(adaptation)
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Newly inherited traits help organisms survive and reproduce in their environment.
Some variations are favorable and help organisms compete to survive and reproduce.
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Example:• Some tarantulas have traits that make it more likely they will survive. •better able to fight off predators
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Adult female Brachypelma smithi, showing a bald patch after kicking hairs off of her abdomen.
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Successful Reproduction
(natural selection)
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Over time, offspring with helpful variations
increase and become a larger percentage of the population.The organisms with favorable variations become plentiful. The ones without favorable variations become rare or extinct.GLE 0807.5.3 - GLE 0807.5.4 - SPI 0807.5.2 - SPI 0807.5.3GLE 0807.5.3 - GLE 0807.5.4 - SPI 0807.5.2 - SPI 0807.5.3
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Example:• Tarantulas best adapted to their environment are likely to survive and reproduce. • Offspring may inherit traits that help them survive.
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