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level: Level 1

Questions and Answers List

level questions: Level 1

Question	Answer
change in population of species over time	theory of evolution
widely accepted hypothesis that can be revised or rejected in the future	scientific theory
suggested that new physical traits could be acquired or lost during one's life through use or disuse and passed onto offspring	theory of acquired traits
when did darwin go to the galapagos	1835
first step in the process of evolution	trait variations from gene mutations
second step in the process of evolution	natural selection
third step in the process of evolution	reproductive inheritance
fourth step in the process of evolution	population adaptation
the frequency of genetic variations in a population	gene pool
ability to survive and reproduce	fitness
physical or behavior traits that increase fitness	adaptations
why do traits have unequal fitness levels	balances overpopulation
organisms with the adaptive trait become more frequent than organisms with less advantageous traits	population adaptation
new species arise when organisms diversify away from a common ancestor	speciation
helps deter different species from mating	reproductive isolation barriers
low genetic variation leads to no adaptations which results in	extinction
what affects rate of evolution	rate of reproduction and how fast the environment changes
rapid evolutionary change followed by a longer period of no change	punctuated equilibrium
slower evolution with more subtle changes that can eventually lead to speciation	gradualism
a historical timeline of change in organisms	fossils
the deeper the fossil the older it is	relative dating
the less radioactive carbon the older the fossil is	radioactive carbon isotope dating