Species - Species: Related genetically. Genes that do not...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
Species: Related genetically. Genes that do not change much: genes that code for enymes that many organisms must have. - Convergent evolution: 2 different organisms that converge together. - Divergent evolution: 2 e from the same ancestor but diverge. Typological: Speciation: process by which new species are formed from preexisting ones. Darwin’s = speciation = multiplication species. Reproduction at individual level vs. reproduction at species level ind: it is programmed, it id driven in particular directions. Output determined by genetic mkeup, the partner. specieS: not programmed. Constrained by phenotypes and phenotypes. Natural selection, mutations, genetic drift. Biological species concept: - Speciation occurs when organisms acquire mechanisms to isolate reproduction. Occurs by preventing fertilization (prezygotic isolation). - If fertilization occurs, and end up with hybrids, but they cannot reproduce (sterile) or are inviable (die). )post-zygotic isolation). Modes of speciation:
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 01/23/2012 for the course BIOL 101 taught by Professor John during the Spring '11 term at The University of British Columbia.

Ask a homework question - tutors are online