Outbreeding increasing genetic variation by producing hybrid offspring which a result of mating between different species

A robust individual which is adapted to the environment is a product of artificial selection.

Inbreeding decreases genetic variation because the parents of the inbred are closely related.

Moths that cannot camouflage and blend in with the environment have high chances to be eliminated by environment.

Gene flow between different populations increases genetic variation and can lead to a speciation.

Genetic drift decreases genetic variation because a random event in a small population will change the allele frequencies.

Bottleneck effect and founder effect change the allele frequencies by resulting certain allele to be overrepresented or eliminated in the future population

A species is a group of individuals that live in the same area, which can interbreed among themselves and produce fertile offspring.

Allopolyploidy can lead to formation of a new species which is known as a sterile hybrid.

Different shapes and sizes of beak among finches in Galapagos Island are due to adaptation of diet for different food sources.

Adaptive radiation causing the arises of many species from a common ancestor due to adaptation to the environment.

Behavioural isolation is when different species are isolated reproductively due to different time of mating.

Sympatric speciation can reduce gene flow and form a new species in overlapping populations in the same place.

Speciation begins with no gene flow between two subpopulation for a very long period of time.