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Natural Selection
Evolution occurred as the result of this
Overproduction
within a population more offspring are produced in each generation than can survive, because of limitations of space and food.
Competition
individuals compete for the available food and opportunity to mate and reproduce.
Variation
within each generation some individuals are better fitted to survive than others because of variations in characteristics.
Survival of the Fittest
those individuals better fitted to survive are more likely to live long enough to reproduce.
Transmission of Favorable Traits (Reproduction)
offspring of the fittest individuals will inherit the favorable variations that enabled their parents to survive and reproduce.
Evolution of Species (Speciation)-
accumulation of favorable variations will gradually lead to the appearance of new species better adapted to their environment.
Weakness in Darwin's Theory
it does not account for genetic basis of variations. At the time, not much was known about the mechanisms of genetic inheritance.
