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• Still interbreed…
selection!! Sympatric Speciation
(mutation that doubles
Offspring of a
tetraploid / diploid
Plants – 70% polyploid 4 10/1/2013 DIVERGENCE Divergence may result in
(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
• 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
versus horseshoe crab 6...
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This document was uploaded on 02/26/2014 for the course ENG 102 at Maryland.
- Spring '12