Species - A group of similar organisms that can breed together to produce fertile offspring, Allele - One of a number of alternative forms of a gene, Allele frequency - The number of each allele in a population, Gene pool - The total number of alleles in a particlar population at a specific time., Directional selection - Where selection favours individuals that vary in one direction., Stabilising selection - Selection that favours average individuals., Normal distribution - A bell shaped curve produced when a certain distribution is plotted on a graph, Anatomical adaptions - Where stuctures of the body of organisms mean they are more suited to survive in their habitat., Physiological adaptations - Where the biochemical reactions or processes inside an organisms mean they are more suited to survive in their habitat., Behavioural adaptations - Where the actions of organisms mean they are more suited to survive in their habitat.,

A Level Biology Chapter 9- 9.3+9.4

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