BIOLOGY 3 Lecture Notes - Lecture 18: Drug Resistance, Disruptive Selection, Antibiotics
Document Summary
Natural selection does not cause progression toward a goal. Natural selection favors those variants with the most appropriate adaptations to the current environment. Survivors are not fittest in an absolute sense, only relative to others in the same population at a given time. Fittest individuals are simply born with particular traits that increase their chances of survival or reproduction in a particular situation. Doesn"t result in the progress of a population towards a particular predetermined goal; instead, it depends on the particular environment in which a population lives: ex. Grasses have not regressed but instead have simply adapted to the environment they experience. Natural selection is a force that causes the traits in a population to change over time. Different environmental conditions may lead to no change in the population or even cause it to split into two species. Directional selection: bacteria responding to the use of antibiotics. Causes the population traits to move in a particular direction.
