BIOL 302 Lecture Notes - Lecture 15: Allopatric Speciation, Indeterminate Growth, Genetic Drift
20 Oct 2016
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Document Summary
Drivers for divergence in a species: morphological adaptation hypothesis, ecological adaptation hypothesis, sexual selection, genetic drift. Spring peeper (frog) has a broad heterogenous range: inherited acoustic signals used primarily for mating, multiple genetic lineages, abundant in eastern north america, northern, western, and southern populations. Only different in temporal attributes (length and rate) Peak frequency is correlated to snout length. Older the frog, bigger the frog (indeterminate growth) Deeper frequency = bigger and older: ecological adaptation hypothesis. Predict that calls will transmit best in their natural habitat. Northern calls experience less degradation overall: sexual selection. Predicts strong correlation between variable variation and genetic variation. Predict exaggerate call differences in secondary contact zone. Friday, october 14, 2016: genetic drift and sexual selection are ???, different forces of selection can act on single trait. What factors allow closely relate species to live together. Traits can be more divergent in sympatric species than allopatric.
