01:119:115 Lecture Notes - Lecture 22: Sympatric Speciation, Niles Eldredge, Punctuated Equilibrium
22 Nov 2015
School
Department
Course
Professor
Document Summary
Sexual selection a. b. c. to the speciation in cichlids fish in lake victoria. Sexual selection for mates of different colors has likely contributed. Sympatric speciation can also result from the appearance of new ecological niches trees. In the 1800"s, they began to infest apple trees (a non-native) The north american maggot fly lives on native hawthorn. Rate of speciation how many genes needed to differ between species record, morphological data, or molecular data. Questions concern how long it takes for new species to form, or. Broad patterns in speciation can be studied using the fossil. The fossil record includes examples of species that appear suddenly, persist essentially unchanged for some time, and then apparently disappear. Niles eldredge and stepphen jay gould coined the term punctuated equilibrium to describe periods of apparent stasis punctuated by sudden change (they studied fossils!) Populations slowly diverge over many generations gradual model) Different to see in fossil record since it is so.
