What is natural selection and who came up with this theory??

2 answers:

7 0

Natural selection is an idea that Charles Darwin came up with.

It attempts to describe how animals and plants evolved by using nature as the determiner of who survives. For example, if there is a fast cheetah population and a slow cheetah population in Africa, the slow cheetah population will eventually die out due to them not being able to catch prey to survive. The fast cheetah had the desirable traits necessary for survival in this location. Only the strong survive is helpful to remember when dealing with natural selection.

il63 [147K]4 years ago

6 0

Charles Darwin came up with the theory. Natural selection follows the "survival of the fittest" rule. This means that animal species evolve based on traits they need, and the traits are determined by which animals survive. The ones that die lack the traits needed for their environment.

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Available data:

Strawberry poison dart frogs have different skin colors
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Frogs eaten by snakes

Number of snake attacks Frog color

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The phenotype of individuals and the environment where they live, interact and determines the genes´ destiny in space and time. The result of this interaction and the gene destiny is Natural Selection. Natural selection selects beneficial alleles and increases their frequency in the population.

The attack by snakes is acting as a selective pressure on the frogs´ population. It is an ecological pressure that is modeling the frogs´ phenotype.

Animals that suffer more attacks are the blue ones, followed by green and red frogs. Those that suffer the fewest number of attacks are the yellow individuals.

So natural selection will be acting on this population favoring the alleles that code for yellow color. Genes that express yellow color increase more the frogs´ fitness than genes that code for the other colors. So natural selection increases the frequency of genes coding for yellow color and will decrease the frequency of the other alleles. Probably the less favored will be genes that express blue.

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