allopatric x sympatric speciation
Cards (18)
- Occurence of Speciation
- allopatric speciation
- sympatric speciation
- Allopatric speciation occurs in dispersal and vicariance
- Dispersal
- geographic isolation due to dispersal and colonization
- divergence
- moving from one place to another
- Vicariance
- geographic isolation by chance separation
- environmental causes
- separation by land
- Sympatric speciation
- genetic isolation
- absence of geological barrier
- less chance of occuring than allopatric
- geographic isolation: coexist
- divergence due to selection
- genetic variation
- ecological niche (sympatric)
- behavioral difference
- Internal sympatric variation
- polyploidy
- auto
- allolo
- auto is self; self reproduction
- allolo means two species
- Polyploidy
- errors in meiosis
- increases number of chromosomes
- creates new species
- autoploidy formation
- diploid 2n
- error in meiosis
- diploid gametes
- fertilization
- multiple chromosomes formed
- Divergence selection
- separate
- behavioral differences
- same geographic space
- drawn by scent
- Sympatric speciation (FERHFo)
- fusion of the populations
- extinction of one population
- Reinforcement divergence
- Hybrid zone formation
- Formation of new species
- Fusion of the populations
- two populations freely interbreed
- no hybrid offspring
- extinction of one population
- one population or species that is better competition for shared resources
- poorer competitor may be driven to extinction
- reinforcement divergence (competition)
- hybrid offspring that have low fitness
- natural selection favors the evolution of traits
- prevents interbreeding between populations
- Hybrid zone formation
- hybridization occurs in a well-defined geographic area
- may move over time or be stable
- Formation of new species
- combination of genes in hybrid offspring
- allows them to occupy distinct habitats or use novel resources
- may be a new species