BIO203H5 Lecture Notes - Cardiac Muscle Cell, Loose Connective Tissue, Cardiac Muscle
Document Summary
Anatomy is the study of an organism"s physical structure. Physiology is the study of how the physical structures in an organism function. Biologists who study animal physiology and anatomy are studying adaptions- heritable traits that allow individuals to survive and reproduce in a certain environment better than individuals that lack those traits. Natural selection not only process that leads to changes in allele frequencies over time. Evolutions occurs through random changes in allele frequencies called genetic drift, through gene flow meaning the movement of alleles in and out of population by migration- and through constant introduction of new alleles by mutation. Natural selection is the only mechanism that increases ability of organisms to survive and reproduce in particular env. One of the most important constraints on adaptation is trade offs, which may involve expenditures of time or energy. A trade off is an inescapable compromise between traits.
