BISC 2 Lecture Notes - Lecture 67: Phenotype
Document Summary
Darwin publishes on the origin of species. Decay rates of radioactive isotopes reveal that. Morgan and sturtevant map genes onto chromosomes. This variation is the raw material upon which natural selection acts. 1) most species produce more offspring than are necessary to maintain a stable population. Not all organisms survive long enough to. 3) individuals within a species will vary in a number of physical characteristics. 4) the variations seen among individuals are the result of different alleles in a population. These traits can be passed onto offspring. Inherent variations occur within a population of individuals. Some individuals will have an advantage over others. Increased ability to acquire food and water. The heritable traits conferring these traits are. 2) reproductive success contributes to genetic adaptations. A measure of an organism"s genetic contribution to the next generation. Depends on the ability to survive long enough to reproduce.
