Natural Selection I Survival of the Fittest?

You may have seen someone shrug and say, “survival of the fittest,” but what does that really mean? What does "fitness" have to do with survival?

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IN THIS EPISODE:
-Mechanism of Evolution
-Trait Variations (Advantageous and Disadvantageous Traits)
-Mutations
-Survival of the Fittest
-Natural Selection Example with Wildflowers (traits that affect reproduction directly and indirectly)

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NGSS
MS-LS4-4 Biological Evolution: Unity and Diversity
Construct an explanation based on evidence that describes how genetic variations of traits in a population increase some individuals’ probability of surviving and reproducing in a specific environment.
MS-LS4-6
Use mathematical representations to support explanations of how natural selection may lead to increases and decreases of specific traits in populations over time.

HS-LS4-2
Construct an explanation based on evidence that the process of evolution primarily results from four factors: (1) the potential for a species to increase in number, (2) the heritable genetic variation of individuals in a species due to mutation and sexual reproduction, (3) competition for limited resources, and (4) the proliferation of those organisms that are better able to survive and reproduce in the environment.
HS-LS4-3
Apply concepts of statistics and probability to support explanations that organisms with an advantageous heritable trait tend to increase in proportion to organisms lacking this trait.
HS-LS4-4
Construct an explanation based on evidence for how natural selection leads to adaptation of populations. HS-LS4-5
Evaluate the evidence supporting claims that changes in environmental conditions may result in (1) increases in the number of individuals of some species, (2) the emergence of new species over time, and (3) the extinction of other species.

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