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explaining the diversity of life on Earth
Evolution
Phylogeny: History of organismal lineages as they change over 9me.
“TREE OF LIFE”
Informative website: http://www.pbs.org/wgbh/evolution/library/faq/index.html
Evolu&onary theory is a unifying principle in biology
Theory: A well-‐substan9ated explana9on for a wide range of observa9ons; a scien9fic theory has been repeated tested and never disproven. Evolu-onary theory is as valid as the theory of gravity.
Evolu&onary theory is a unifying principle in biology
Evolu&onary theory is a unifying principle in biology
Time -‐ Mul9ple genera9ons
Heritable (gene9c) varia9on
Mechanisms of evolu9on
Micro-‐evolu&on Macro-‐evolu&on
The diversity of life
Natural selec&on
Evolu&on: change in the frequency of heritable traits (allele frequencies) in a popula6on over the 6me of genera6ons.
DEFINING EVOLUTION
Summarize with “VISTA”
u Varia9on u Inheritance u Selec9on u Time u Adapta9on
Varia9on Physiological, anatomical, behavioral traits that result from RANDOM MUTATION.
Inheritance: Biological traits are encoded in DNA.
Individuals with par9cular traits are more likely to reproduce than others.
SELECTION: Differen9al survival and reproduc9on
TIME:
biological evolu9on occurs over 9me
Misconcep9on: Evolu9on takes place over TIME and doesn’t affect INDIVIDUALS but rather POPULATIONS.