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11 Cards in this Set

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What is cladogenesis, what is anagenesis?
Anagenesis->phyletic speciation (one species to another by change within a lineage)

Cladogenesis->branching evolution/new species arise of buds off (basis of biological diversity; new species are added to tree of life)
Review the Biological Species Concept.
BSC-Critical criteria for identifying species is reproductive isolation
Be able to differentiate between Premating/Prezygotic, Postmating/Prezygotic and Postzygotic barriers
Premating/prezygotic->geographic tempural timing, habitat, and behavior
-prevents individuals of different species from mating

Postmating/prezygotic->gametic-gametes wont fuse (sperm does not match egg); mechanical-"lock & key" female & male genitals don't fit

Postzygotic barriers-> hybrid inviability (hybrids don't survive)
Hybrid infertility-viable but infertile
Hybrid F2 breakdown (2nd generation reproductively sterile)
What are the premating and postmating barriers? What are postzygotic barriers?
geographic
temporal habitat
behavioral
What is a hybrid?
interbreeding between what looks like 2 good species resulting in formating of new species
What is anagenesis? What is cladogenesis?
Anagenesis->phyletic speciation (one species to another by change within a lineage)

Cladogenesis->branching evolution/new species arise of buds off (basis of biological diversity; new species are added to tree of life)
In very general terms what does the Biological Species Concept state about the nature of species?
Species are populations that contain indivduals that mate with each other & produce fertile offspring
They are not reproductively isolated
What are some of the problems with the Biological Species?
1>Not everything reproduces sexually
2>There are individuals that freely hybridize
3>Geography (nature dont match but may in lab)
4>Fossils
5>IOsolating mechanism secondary
Be able to define the terms sympatric and allopatric.
Sympatric-> "together homeland" speciation occuring where gene flow is possible

Allopatric-> "different homeland" physical splitting of habitat isolates populations
ex: earthquakes, mountain uplift
-GENE FLOW IS NOT POSSIBLE
What is the phylogenetic species concept?
Concept that species are best identified as the smallest monophyletic group of organisms
-interested in common ancestory, common evolutionary history
What is the morphological species concept?
Researchers use to identify independent lineages by differences in size, shape, or other morphological features