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BHS Bio Evolution

Evolution unit key terms

QuestionAnswer
Population -Kouki All the members of a species that 1.Live in the same area. 2. Breed with each other.(Not can breed but do breed)
Mutation -Kouki Any change in the DNA
Genetic Drift -Chris E. The change in the frequency of an allele in a population (i.e. how many organisms in the population possess that trait) due to random events. Much more noticeable in smaller populations.
Gene Pool -Chris E. The total amount of genetic information available to a population (i.e. which traits are available to a population).
Disruptive Selection - Sara D. Changes in a population genetics that favor individuals at both extremes of the distribution graph.
Stabilizing Selection - Sara D. The genetic diversity decreases as the population begins to maintain a certain trait value.
Postzygotic Isolation - Chris N. Isolation which takes place after two different species have mated and an embryo is usually unable to produce.
Punctuated Speciation - Chris N. Speciation that takes place very rapidly with long periods of equilibrium, stasis.
Niche- Brittany C. The position or function of an organism in a community of plants and animals.
Natural Selection- Brittany C. the process by which forms of life have traits that better enable them to adapt to specific environmental pressures. Those surviving will reproduce and their favorable traits will be passed on to succeeding generations
Niche- Brittany C. The position or function of an organism in a community of plants and animals.
Natural Selection- Brittany C. the process by which forms of life have traits that better enable them to adapt to specific environmental pressures. Those surviving will reproduce and their favorable traits will be passed on to succeeding generations
Bottleneck Effect - Katie Ralston Is a severe reduction in a population size
Founder Effect - Katie Ralston A type of bottlenecking, except it happens when a few individuals leave a population and start a new one.
sympatric speciation (Jimmy Dye) when two species occupy the same range, but change their niche. Like when a new species becomes nocturnal and the parent species is active during the day, they no longer interact.
Allopatric speciation (Jimmy Dye) occurs when a population becomes geographically divided.
Adaptive Radiation- Gloria O. Diversification of a species or single ancestral type that go into several forms that are each adaptively specialized to a specific environmental niche.
Gradual Speciation-Gloria O. speciation takes place over long periods of time by the gradual accumulation of many small changes. This is the thought to be the norm for most speciation events.
biological species concept - Kyrylo Z. Organisms are classified in the same species if they are potentially capable of interbreeding and producing fertile offspring.
Mechanical isolation - Kyrylo Z. The two subspecies' genitals have changed shape enough that they don't physically fit together anymore.
Gene flow -Emily Fenger the alteration of the frequencies of alleles of particular genes in a population, resulting from interbreeding with organisms from another population having different frequencies.
Variation -Emily Fenger a difference or deviation in structure or character from others of the same species or group.
Temporal Isolation-Kally Barker refers to breeding at different times during the day or year.
Hybrid-Kally Barker Produced from the mixture of two species; as, plants of hybrid nature.
Adaptive Radiation-Kally Barker evolution of an animal or plant group into a wide variety of types adapted to specialized modes of life.
Behavioral Isolation -Kristin Schmidt An isolating mechanism in which two species do not mate because of differences in courtship behavior. (Also known as ethological isolation)
Mass extinction -Kristin Schmidt The process in which huge numbers of species die out suddenly. (The dinosaurs)
Microevolution-Thanh Huynh evolution resulting from small specific genetic changes that can lead to a new subspecies
Speciation-Thanh Huynh The evolution of one or more species from an existing species
Created by: Ms Henshaw
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