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Biology powerpoint 11
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Look identical morphologically, but are reproductively isolated
Cryptic Species
Phylogenetic Species Concept
smallest monophyletic groups on the tree of life
Monophyletic group
A group that consists of an ancestral population and all of its descendants and only its descendants!
Prezygotic isolation
mechanical barrier
Postzygotic Isolation •Zygote does not develop, or embryo aborts •Hybrids die before sexual maturity •Hybrid sterility
•Zygote does not develop, or embryo aborts
•Hybrids die before sexual maturity
•Hybrid sterility
Problems with the Biological Species Concept
•Asexual organisms •Fossils •Hybridization
Monophyly is defined
by at least one derived trait that is unique to the group and occurs in all members of the grou
The shared, derived trait is called
asynapomorphy
What are the Species concepts
• Biological Species Concept
• Morphospecies Concept
• Phylogenetic Species Concept
Morphospecies Concept• based on differences in shape, size, orother morphological features
• based on differences in shape, size, orother morphological features
Author
zzto
ID
134275
Card Set
Biology powerpoint 11
Description
Biology 1200 specialization
Updated
2012-02-10T16:48:35Z
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