Biology powerpoint 11

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

134275

Card Set

Biology powerpoint 11

Description

Biology 1200 specialization

Updated

2012-02-10T16:48:35Z

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