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
What is the study of evolutionary RELATIONSHIPS
Phylogenetics
Who introduced taxonomy?
Linnaeus
What is a clade?
A group with common ancestor
What is the two word name created by Linnaeus?
Genus, Species
