Reproductive Isolation
A group of individuals that make up a population capable of producing fertile offspring with each other.
What is a species?
Gene flow is reduced when two populations become isolated due to a geographic barrier.
What is allopatric speciation?
A hybrid zone is an area where these meet and mate.
What are different species?
A period of very little, or no, change punctuated by sudden change.
What is punctuated equilibrium?
Lake Victoria cloudy water has resulted in a hybrid species of Pundamalia fish by
What is Fusion?
Offspring that result from interspecific mating.
What are hybrids?
A new species originates while remaining in the same geographic area.
What is sympatric speciation?
Toads living here are an example of a hybrid zone.
What is Europe?
New species change most as they branch from a parent species and then change very little the rest of their existence.
What is the punctuated model?
Hybrids continue to form in the Bombina zone because of this.
What is narrow?
Reproductive barriers that impede mating or hinder fertilization.
What are prezygotic barriers?
This example of speciation has individuals of high predation not being able to mate with those encountering low predation due to natural selection.
What is a mosquitofish?
Type of barrier that exists between the yellow-bellied toad and the fire-bellied toad.
What is postzygotic?
These suggest that once the process of speciation begins it can be completed relatively rapidly.
What is a punctuated pattern?
Reproductive barriers impede this.
What is gene flow?
Genes of different parent species interact in a way that impair the hybrid's development or survival.
What is Reduced Hybrid Viability?
A species arising from an accident during cell division resulting in extra sets of chromosomes.
What is polyploidy?
This results in weakened reproductive barriers resulting in the two species becoming one.
What is fusion?
Species diverge from one another more slowly and steadily over time.
What is the gradual model?
The North American apple maggot fly is a species that feeds on apples. It is reproductively isolated from original flies that fed on this type of tree.
What is a hawthorn?
Form of prezygotic isolation where the sperm may not be able to fertilize the eggs of another species.
What is gametic isolation?
Reproduction isolation in allopatric speciation increases as this increases.
What is geographic distance?
When reproductive barriers are strengthened resulting in hybrids gradually ceasing.
What is Reinforcement?
Scientists have found that speciation can occur from a single
What is a gene?
These are fertile when mating with each other but cannot interbreed with either parent species and represent a new biological species.
What is allopolyploid?