Natural Selection Charles Darwin and his revolutionary ideas.

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Presentation transcript:

Natural Selection Charles Darwin and his revolutionary ideas

Natural Selection Definition: reproductive success over the long run - the genes that are passed on are best suited for the environment Survival of the Fittest: Does this always mean the strongest?

The Four Ingredients for Natural Selection Individuals within species vary Variation comes from mutations and meiosis (sexual reproduction) More offspring are produced than can survive The individuals that survive are the ones with the variations best suited for the environment and they have offspring

Variation among species This graph shows that the Penguins are all different sizes, 18 lbs is the most common. Yet The range is lbs. This is genetic variation

Which Moth Has A Better Chance Of Survival? These are the same species of moth, yet they show variation among a species.

Same Species and Variation A varied gene pool creates these differences. Are there benefits in variations?

Genetic Differences: Genotype and phenotype variation Two parents can produce offspring with different genetic characteristics. Some characteristics enable better survival rates. These traits are passed on.

EXCESS REPRODUCTION (# of offspring [eggs or seeds] per reproductive season) Starlings4 – 6 Bull frog6,000 – 20,000 Trout200 – 6,000 Eastern OysterUp to 1,000,000 RagweedUp to 3,000 Lamb’s Quarters90 – 50,000

Species best suited to environment have offspring (pass on genes) Evolution- How Does Evo#