Mutation - a random change in the structure of a gene, chromosome or number of chromosomes, producing new alleles., Mutagenic agent - environmental factors that increase the rate of mutations, Examples of mutagenic agents - Radiation or chemicals causing a mutation., Variation - occurs as a result of mutations that create new alleles of genes producing different characteristics. making it possible for a population to evolve over time in response to changing environmental conditions., Adaptation - Some individuals are better adapted to their environment than others as a result of characteristics they have inherited from their parents. They may have a better ability to avoid predators, compete for food, or resist disease., Natural selection - individuals that survive selection pressures as they have a selective advantage allowing them to survive., Species - a group of organisms that can interbreed and produce fertile offspring, Speciation - the formation of two or more species from one original species, Isolation barrier - Divides a one population into two or more sub-populations, Allele - a different form of a gene,




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