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How has natural selection influenced antibiotic effectiveness

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How has natural selection influenced antibiotic effectiveness

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- When the more resistant bacteria survives and replicates, due to natural selection, the more common they become and the less the antibiotics will work.

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Antibiotic resistance: The ability of bacteria to resist the effects of antibiotics they were once sensitive to.

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Factors that help create genetic variation

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Factors that help create genetic variation

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- Genetic Drift
- Gene flow
- Non- random mating
- Mutations
- Natural selection

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- Study of embryonic development of organisms
- Evolution: Similar structures of embryos may suggest the specices evolved from commmon ancestors

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- studies genes and proteins to provide support fro biological evolution
- Evolution: More similar DNA and amnio acid sequences of species, they more likely they diverged from a common ancestor.

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- Studies prehistoric life
- Evolution: Compares current and ancient species to show a pattern of change.

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-Study of the structure of organisms
- Evolution: If a species encounters a different ecosystem favorable traits become established.

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Ex: Whale pelvis

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Ex: Dogs leg and cat leg

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- overproduction of offspring: Population having many offsprings increases survival chance but also increases competetion for resources.
Ex: Many squirrels but only a few trees with nuts as food source.
- variation : Different phenotypes controlled by genotype and environment
Ex: Different bird beaks
-adaptation: Structure in population of organisms that help them survive
Ex: White fur in polar bears for camouflage
- Descent with modification:
Change in genetic composition of a population from generation to generation.
Ex: Giraffe neck lengths

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- Natural selection

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changes that transformed life

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Ex: bat and butterfly wing