Biology 1201A Lecture Notes - Lecture 6: Heritability, Microevolution, Single-Nucleotide Polymorphism
14 Jul 2016
School
Department
Course
Professor
Document Summary
Investigating evolution by natural selection: darwinian snails activity. When there is no phenotypic variation in shell thickness, the snail population will not evolve or change. If a phenotype is heritable, then the offspring will reflect those individuals that reproduced. Implications on the way a population changes over time: Predictable direction evolution or change is possible when phenotype is heritable, but how a population evolves for non-heritable traits is not predictable (depends on offspring) When death" or reproduction is random, the population could evolve in any direction (what direction it does go in is ultimately random). Differences in survival and reproduction is selective (linked to phenotype) Time (change from one generation to the next) Differential survival and reproduction of individuals in a population due to current environmental influences. The degree to which an individual contributes offspring (genes) to future generations. Absolute fitness (w): the number of offspring a particular phenotype has. Relative fitness (w): relative to others in the population.
