front 1 phenotypic variation | back 1 differences of observable traits from organisms in a species |
front 2 genotypic variation | back 2 differences in the DNA sequence among individuals of a species |
front 3 sources of genetic variation | back 3 mutations and recombinations |
front 4 mutation | back 4 generates new variations in DNA sequences |
front 5 recombinations | back 5 shuffle existing variations to make new combinations |
front 6 somatic mutation | back 6 affects only the cells descended from the cell in which the mutation originally arose, affects individuals not passed to offspring |
front 7 germ-line mutations | back 7 occur in productive cells, passed on to the next generations |
front 8 point mutation | back 8 one base pair is replaced by a different base pair |
front 9 duplication mutation | back 9 segment of DNA is repeated |
front 10 deletion | back 10 segment of DNA removed |
front 11 transposable elements | back 11 DNA sequence that can jump from one place to another |
front 12 allele frequency | back 12 the number of allele x present in the population divided by the total number of alleles of that gene; patterns of genetic variation |
front 13 genotype frequency | back 13 proportion of each genotype at a particular gene or set of genes |
front 14 genetic drift | back 14 random change in allele frequencies from generation to generation |
front 15 bottleneck | back 15 when a large population is reduced to just a few individuals |
front 16 founder effect | back 16 occurs when a few individuals from a larger population establish a new population |
front 17 migrations | back 17 movement of individuals from one population to another |
front 18 gene flow | back 18 the movement of alleles from one population to another |
front 19 mutation | back 19 source of genetic variation and a mechanism of evolution |
front 20 nonrandom mating | back 20 individuals preferentially choose mates according to their genotypes |
front 21 hardy Weinberg equilibrium | back 21 occurs when the genetic makeup of a population does not change over time |
front 22 null hypothesis | back 22 a hypothesis that states that nothing is occurring |