BIOL 350 Lecture Notes - Lecture 2: Natural Selection, Genetic Variation, Antimicrobial Resistance
7 Jun 2017
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Chapter 2 - a primer on evolutionary roots. Failure of certain individuals to leave descendants through reproduction or to leave as many descendants compared to other individuals. This is due to a lack of certain phenotypic traits or a combination of particular traits that promote survival and reproductive success. Natural selection acts most directly on traits (phenotypic characteristics) which in turn affect the success of individuals in their growth, survival and/or reproduction. It does not act on individuals or genes directly. Traits that are favoured by natural selection will be passed onto subsequent generations meaning these genes have a higher evolutionary fitness under prevailing environmental conditions. Group selection - genotypic variation between competing social groups that generates differential group success measured by size & prosperity over time. Cultural selection - certain behavioural or cultural phenotypes that result from social learning are transmitted to subsequent generation by copying and communication (eg oral and written)
