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variation in secondary sexual characteristics used in competing for and attracting mates
structures that have the same function because of adaptations to similar environments, not common ancestors
remnants of structues that served important functions in the organism's ancestors
presences of two or more phenotypically different forms of a trait in a single population of a species
2N condition maintains and shelters a hidden pool of alleles that may not be suitable for present conditions but that could be advantageous if conditions change
the hybrid state is selected for because it has a greater survival rate and reproductive success
frequency dependant selection
works to decrease the frequency of the more common phenotypes and increase the frequency of the less common phenotypes
evolutionary neutral traits
no selective value and scientists don't know why they have stayed in the human population
natural disasters reduce the size of a population resulting in a loss of genetic variation
individuals better adapted to an environment survive and have more offspring to pass their genes to
two related species that have made similar evolutinoary adaptations after their divergence from a common ancestor
branch of biology that focuses on classifying organisms and determining their evolutionary relationships
a branching diagram that represents a hypothesis about the evolutinoary history of a group of organisms
population whose members have the potential to interbreed in nature and produce fertile offspring
a species goes through little or no morphological change followed by brief periods of sudden change
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