Speciation - created from Mind Map

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Species

The divergence of biological lineages and emergence of reproductive isolation

Species Concepts

Genetic Basis

Barriers to Gene Flow

Contact Between Newly Formed Species

Rates of Speciation

Groups of organisms that mate with one another and produce fertile offspring

Result of speciation

Morphological Species Concept

Biological Species Concept

Lineage Species Concept

Linnaeus

Based on appearance

Limitations

Look alike due to alleles

Sexual Dimorphism

Immature/Adult Stages

Cryptic Species

Reproductive Isolation

Excludes asexual organisms

Groups of interbreeding populations

Includes asexual organisms

Daughter species

Lineage

Speciation requires evolution of reproductive isolation

Dobzhansky-Muller Model

Barrier to gene flow

Fixed alleles

Genetic incompatibility

Chromosomal rearrangment

Allopatric Speciation

Sympatric Speciation

Geographic barrier

Dominant form

Genetic Drift

Mutations

Sister species

Founder event

Physical isolation

Without physical isolation

Disruptive selection

Polyploidy

Autopolyploidy

Allopolyploidy

Tetraploid

Hybridization

Hybridization

Prezygotic Isolating Mechanisms

Postzygotic Isolating Mechanisms

Reinforcement

Prevent hybridization

Mechanical

Temporal

Behavioral

Habitat

Gametic

Reduces hybrids fitness

Low hybrid zygote viability

Low hybrid adult viability

Hybrid infertility

Influential Factors

Evolutionary Radiation

Adaptive Radiation

Diet

Pollination

Sexual Selection

Dispersal