BSC 385 Study Guide - Midterm Guide: Outcrossing, Lek Mating, Thermocline
22 Mar 2016
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Document Summary
The study of interactions between an organism and its biological/physical environment. Abiotic environment (temp, water availability, soil, salinity, nutrients) Observations: variability of life forms, similarities suggesting relatedness. Phenotype- an observable measurable characteristic of an organism. Hardy-weinberg equilibrium p2 + q2 = 1 p + q = 1. Darwinian fitness- the ability of an individual genotype or phenotype to both survive and reproduce. W = the average contribution of an average individual of a certain genotype to the gene pool of the next generation. Occurs when a particular genotype does not survive or reproduce in the same proportion as others. Selection coefficient- the proportion of a particular genotype that is not represented in the next generation. Directional selection favors a shift towards one of the tails of the normal distribution. Stabilizing selection- individuals in both tails of the curve are at a selective disadvantage. Disruptive selection occurs when the tails of the distribution are favored over the intermediate phenotypes.
