BI111 Lecture Notes - Lecture 3: Heterozygote Advantage, Normal Number, Genotype
Document Summary
Lamarcks contributions to evolutionary thought: species change with time, changes pass on from one generation to the next, organisms respond to environmental conditions, hypothesized mechanism (principle of use and disuse and principle of inheritance of acquired characteristics) Observation: populations have great capacity to grow, but are ultimately limited by resource availability: inference: competition b/w individuals in a population for resources. Observation: individuals vary within populations in heritable traits related to competitive success (ultimately survival: inference: some individuals more likely to survive and reproduce than others. Observation: individuals may also vary in populations in heritable traits related to reproductive competitive success: inference: some individuals more likely to reproduce than others. Adaptive evolution: a population"s characteristics change over time, as advantageous traits become more common. Competition for seeds among finches: if resources were not limiting, there would be no consequences for phenotypic variation.