PSY 111 Chapter Notes - Chapter 7: Allele Frequency, Birth Weight, Aureus
Document Summary
A population is a group of organisms of the same species living together in the same area. An entire population can change (evolve) when some traits are favored over others. Fitness: organism"s ability to survive and reproduce in a particular environment. Higher fitness = increased likelihood of alleles being passed to next generation (the next generation will acquire the traits required to survive) Alleles that confer resistance to antibiotics increase an organism"s fitness. Organisms alleles or genotype (what"s on your genes) determines your phenotype ( what you see) Interplay between phenotype and environment determine frequency of traits in a population. If traits improve fitness, traits become more common in population (overtime genetics may change so that the organisms genes are the best for its environment) Populations experience changes in allele frequencies over time. Natural selection: differential survival and reproduction of individuals within a population in response to environmental pressure.
