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  • March 17, 2013
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10m - Patterns of Evolution

Macroevolution – The large-scale evolutionary changes that take place over long periods of time.

Word Bank: resemble, response, factors, interrupted, species, niches, extinction, ancestry, dolphins, evolve.

← Mass Extinctions
← There have been several mass extinctions – at least 5. ▪ More than 99% of 1) _ _ _ _ _ _ _ that ever existed are now extinct (extinct = gone forever). ← There may be many 2) _ _ _ _ _ _ _ causing each.

▪ Ex. The Cretaceous extinction (65 m.y.a.) – Asteroid? Volcanoes? Global Warming?
← There is always ecological opportunity following a mass 3) _ _ _ _ _ _ _ _ _ _. ▪ Ex. Mammals crawl out of there holes or down from the trees and 4) _ _ _ _ _ _ into Earth’s most dominant life-forms. ← Adaptive Radiation

← When a single group or species evolves into several different forms with different 5) _ _ _ _ _ _ (creating new species in the process). ← Can happen on a large scale – Ex. reptiles, mammals. ← Convergent Evolution

← Environmental pressures make unrelated organisms 6) _ _ _ _ _ _ _ _ each other. ▪ Ex. Sharks, Penguins, and 7) _ _ _ _ _ _ _ _
← Analogous Structures – parts that look/function similarly, but don’t share common 8) _ _ _ _ _ _ _ _. ← Coevolution
← The process by which two species evolve in 9) _ _ _ _ _ _ _ _ to each other’s changes over time. ← Punctuated Equilibrium
← Long, stable periods 10) _ _ _ _ _ _ _ _ _ _ _ by rapid bursts of evolution ← Developmental Genes and Body Plans
← Hox genes – Dr. Ed Lewis’ Noble Prize for “master control genes”.