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Chap. 15 Vocab
Terms in this set (28)
Breeding organisms with specific traits in order to produce offspring with identical traits.
organisms that possess favorable adaptations survive and pass them onto the next generation
The gradual change in a species over time
New feature that had not appeared in common ancestors
a characteristic that existed in an ancestor
Structures in different species that are similar because of common ancestry.
Structure that is inherited from ancestors but has lost much or all of its original function
Body parts that share a common function, but not structure
An organism in the earliest stage of development
Study of past and present distribution of organisms
Ability of an organism to survive and reproduce in its environment
the act of concealing the identity of something by modifying its appearance
a defense in which one organism resembles another that is dangerous or poisonous
In a stable environment, the allele and genotype frequencies of a population will remain constant.
Random change in allele frequencies that occurs in small populations
Change in allele frequencies as a result of the migration of a small subgroup of a population
A change in allele frequency following a dramatic reduction in the size of a population
favors intermediate variants and acts against extreme phenotypes
Where an extreme phenotype is wanted more than other phenotypes in natural selection. This causes the allele frequency to change as time goes by.
favors individuals at both extremes of the phenotypic range
Natural selection for mating success
Prezygotic isolating mechanism
Factor that prevents individuals from different species from mating; operates before fertilization
Postzygotic isolating mechanism
mechanisms that occur after a zygote has been formed
The formation of new species in populations that are geographically isolated from one another.
The formation of new species in populations that live in the same geographic area
An evolutionary pattern in which many species evolve from a single ancestral species
The theory that evolution occurs slowly but steadily
The theory that species evolve during short periods of rapid change
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