BIOL 150 Chapter 5.docx - 5.1 Adaptations Natural Selection...

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5.1: Adaptations – Natural Selection Promotes Adaptive Traits Natural Selection – differential success in survival and reproduction of individuals that arises from their interactions with the environment Natural Selection has two necessary conditions: o Variation exists among individuals in a population in some heritable trait o The variation in a population causes individuals to differ in survival and reproduction Fitness – the proportionate contribution an individual makes to future generations Survival is necessary for fitness but reproducibility is what determines it Evolution – Changes in gene frequency of a population over generations Adaptation – heritable behavioural, morphological, or physiological trait that has evolved over time by natural selection such that it maintains or increases the fitness of an organism under a given set of environmental factors 5.2: Genes – Adaptions are Coded by Genes (Basic Units of Inheritance)
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