Ch. 14: Speciation and Extinction Flashcards
Type of speciation that involves separation of a species who develop separate traits.
Allopatric
Little bursts of speciation interrupt long periods of little change:
Punctuated equillibrium
Sympatric speciation:
species develop new genes in a community
When does sypmatric speciation occur in plants?
Plant cells become Polyploid
What are the 5 prezygotc barriers?
- Habitat
- Temporal: active during different parts of the day
- Behavioral: different courtship rituals
- Mechanical: issue with reproductive structures
- Gametic: inability to fertilize
3 postzygotic barriers:
- Hybrid inviability: embryo dies before maturing
- Hybrid Infertitlity: Offspring can not reproduce
- Hybrid breakdown: abnormalities
Define Hybrid:
Offspring of two different species
Separation of species due to factors that prevent reproduction:
Reproductive Isolation
Define speciation:
new species when members can no longer interbreed with the group
What is the concept that defines species as members of a single group that can interbreed and produce offspring?
Biological Species Concept
Linnaeus defines species:
creatures alike in body structure
Two groups of reproductive barriers:
Post and prezygotic
Two types of speciation:
Allopatric and Sympatric
Impact Theory:
Comet crashd and black sunlight
Place Taxonomic system in order
Domain Kingdom Phylum Class Order Family Genus Species
