L567 lecture 22

L567 lecture 22 - Lecture 22 L567 L567. The ecology of...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Lecture 22 L567 L567.  The ecology of speciation Speciation…  The mystery of mysteries.   Questions 1.  Can we explain speciation with microevolutionary forces  (mutation, selection, drift), or must we appeal to  “macroevolutionary forces” like species selection? 2.  Can we explain saltation in the fossil record (phenotypic  jumps)?  ( Remember that Huxley said that gradual  evolution was an unnecessary burden ) 3.  Is there natural selection for speciation? Species defined: The biological species concept ( BSC , Mayr 1942):  Species  are groups of actually or potentially interbreeding  individuals that are reproductively isolated from other  such groups. The tautological species concept ( TSC , Lively 1994):  species are the products of speciation events. 1
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Lecture 22 L567 Process of speciation (aside on teaching undergraduates) Step 1:   Population of interbreeding organisms becomes broken 
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 6

L567 lecture 22 - Lecture 22 L567 L567. The ecology of...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online