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Chapter 22
"The Origin of Species" Evolutionary Biology, BIOL 152 CSU Chico
Question | Answer |
---|---|
sympatric | species that occur together |
gene pools | all alleles present in a species |
biological species concept | "...groups of actually or potentially interbreeding natural populations which are reproductively isolated from other such groups." |
reproductively isolated | populations whose members do not mate with each other or who cannot produce fertile offspring |
reproductive isolating mechanisms | prevent genetic exchange between organisms |
prezygotic isolating mechanisms | prevent the formation of zygotes |
pheromones | chemical signals |
reinforcement | improvement of isolating mechanisms resulting in complete reproductive isolation |
polyploidy | produces individuals that have more than two sets of chromosomes |
autoploidy | all of the chromosomes come from a single species |
allopolyploidy | two species hybridize |
adaptive radiation | groups of closely related species that have recently evolved from a common ancestor and have adapted to their environments |
key innovation | evolves within a species allowing it to use resources that it couldnt use before |
gradualism | evolution occured very slowly |
stasis | little or no evolutionary change |
punctuated equilibrium | long periods of stasis punctuated with small bursts of evolution |