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Chapter 18

Horizontales
A genetic diversity mechanism that causes a random change in DNA.
The theory that all life has evolved and diversified from a common ancestor.
Reproductive barriers weaken until the two species become one.
A type of evolution in which similar traits develop independently in 2 species that do not share a common ancestor.
A type of evolution in which 2 species evolve in diverse directions from a common point.
Physical or genetic separation results in less likley mating or infertile offspring.
Structures that no longer have an appearent function.
Similaritites occur because of similar selection pressures.
A group of individual organisms that interbreed to produce fertile viable offspring.
The type of siolation that occurs ehrn the presence or absence of a specific mating behavior prevents reproduction from taking place.
When a natural situation arises to physically divide organisms.
Verticales
Fit hybrids continue to be produced.
A type of speciation that involves evolutionary speciation in the same location as the parent species.
A genetic diversity mechanism in which each parent has a unique combination of gene alleles, which combine to produce unique genotypes.
When a few members of a species move to a new geographical area.
A barrier that causes organisms not to survive embryonic stages, are born sterile, or show greatly reduced fitness and failure to thrive.
Hybrids are less fit than either purebred species, so the species continues to diverge until hybridization can no longer occur.
A barrier that prevents fertilization or blocks reproduction from taking place.
The type of speciation that involves geographic seperation of populations from a parent species, and subsequent evolution into a new species.
Formation of 2 species from 1 original species.
Something that natural selection requires among individuals in a population that has genetic diversity.
Structures that have maintained the same overall skeletal arrangement despite evolution leading to changes in the shapes and sizes of the bones.
A type of seperation that prevents a population from locating mates, which stops the free-flow of gene alleles.
These provide solid evidence that organisms from the past are not the same as those found today.