Organic evolution Exam 1

Terms in this set (154)

-Separation of Phenotype and Genotype

-No inheritance of acquired characteristics

-Hereditary variations are based on genes that retain their identity thru generations, they stay discrete and don't blend.

-Mutation is random and along with recombination is the source of genetic variation required by evolution.
-Pop is the unit of evolution. Evolution is a change in the freq. of alleles in a pop.

-Changes in gene freq. may be random/nonrandom, that is by drift/natural selection or both.

-Natural selection can account for slight and great differences among species.

-Many phenotypic characters are affected by numerous genes at diff. loci.

-Natural selection can give rise to new phenotypes by increasing the freq. of alleles that may form new combos with other genes.
Populations can accumulate genetic variation.

-Pops in diff. geographic regions differ in characteristics that have a genetic basis.

-Diff.'s b/t species and b/t pops of same species are often based on diff.'s at many genes, each w/ a small phenotypic effect.

-Species are def.'d by ability to interbreed and thus a shared gene pool. They do not interbreed with others.
Speciation usually occurs by the genetic differentiation of geographically segregated populations.

-Higher taxa arise by the prolonged, sequential accumulation of small diff.'s rather than by sudden mutational production of new "types'.

-All life forms a great 'tree of life" that has dev.'d by the branching of common ancestors

-Natural Selection, Genetic Drift, & Sexual Selection are most effective forces in evo.

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