What Is Evolution? (OCR A-Level Biology A): Flashcards
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General theory of evolution
General theory of evolution
Organisms have changed over time and continue to change
Special theory of natural selection
Special theory of natural selection
Explains the mechanism by which evolution occurs
Year Darwin & Wallace jointly presented ideas
Year Darwin & Wallace jointly presented ideas
1858
'Descent with modification' meaning
'Descent with modification' meaning
Organisms inherit traits that may change over generations
Interspecific variation
Interspecific variation
Differences between species
Intraspecific variation
Intraspecific variation
Differences within a single species
Discontinuous variation control
Discontinuous variation control
Controlled solely by genes; environment has no effect
Continuous variation control
Continuous variation control
Controlled by both genes and environment
Polygenes
Polygenes
Multiple genes controlling a characteristic
Normal distribution features
Normal distribution features
Symmetrical bell curve; most individuals cluster around mean