speciation to post 2

sympatric speciation via polyploidy mutation that

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

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: cent perception • Still interbreed… for now… • Disruptive selection!! Sympatric Speciation via Polyploidy (mutation that doubles DNA) Offspring of a tetraploid / diploid mating sterile Plants – 70% polyploid 4 10/1/2013 DIVERGENCE Divergence may result in Reproductive Isolation (Biological Species Concept): Pre fertilization Barriers 1. Habitat – live in different places 2. Behavioral – e.g. diff. mating dance 3. Temporal – diff. breeding times 4. Mechanical – physical incompatibility 5. Gamete – sperm and egg can’t fuse -Pre: Prevents sperm and egg from coming together -Can also result in morphological changes or phylogenetic differences Post fertilization barriers hybrid weak or infertile. Can also get hybrid zones (healthy hybrid) Adaptive Radiation • Many new species from one species • Either new habitats or morphological innovation • Finches, cichlids (fish), fruit flies, mammals! 5 10/1/2013 “Speciation Cascades” Speciation Begets Speciation -Some species are more likely to speciate than others • Groups who speciated in past more likely to speciate in future • Drosophila and cichlids (speciators; adaptive radiation) versus horseshoe crab 6...
View Full Document

This document was uploaded on 02/26/2014 for the course ENG 102 at Maryland.

Ask a homework question - tutors are online