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Evolution Test
Evolution, natural selection, Darwin, etc.
27
Biology
9th Grade
03/08/2011

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Term
Hardy-Weinberg
Definition
Genetic Equilibrium that states an "ideal" population that is not evolving would include
1.No mutations
2.No individuals coming or leaving
3.A large population
4.Individuals mating randomly
5. Selection not occuring
Term
Immigration
Definition
Movement of individuals into a population.
Term
Emigration
Definition
Movement of individuals out of a population.
Term
Phenotype
Definition
appearance
Term
Polygenic Trait
Definition
A trait controlled by two or more genes. Shown with a line graph. Usually shows with bell shaped curve.
Term
Reproductive Isolation
Definition
When members of two species cannot interbreed and produce fertile offspring.
Term
Evolution
Definition
Change over time or a change in allele frequency.
Term
Variation
Definition
Differences in living things.
Term
Stabilizing Selection
Definition
Individuals near the center of the curve have the best fitness. The bell shape narrows.
Term
Disruptive Selection
Definition
The individuals at the right and left ends of the graph are the best fit. The individuals in the middle are the least fit. Graph caves in, in the middles or seems to split in two.
Term
Founder Effect
Definition
A group with similar traits colonize a new area.
Term
Temporal Isolation
Definition
Reproduce at different times.
Term
Behavioral Isolation
Definition
Can interbreed but they have difference courtship behavior Ex.dance, songs, etc.
Term
Geographical Isolation
Definition
Separated by barriers such as rivers, mountains, desert, etc.
Term
Gene Shuffling
Definition
Meiosis and crossing over. One allele from each parent.
Term
Population
Definition
The members of a species in a given area.
Term
Natural Selection
Definition
Environmental Pressure.
Term
Adaptation
Definition
Any inherited traits that increase the chance of survival.
Term
HMS Beagle
Definition
The ship that Darwin boarded that led him to propose a revolutionary hypothesis about life.
Term
On The Origin of Species
Definition
The book on Darwin's findings about evolution.
Term
Genetic Drift
Definition
When the population is small and individuals have more offspring, so they pass on more traits.
Term
Single Gene Trait
Definition
A trait that is controlled by a single gene with two alleles. Can be shown with a bar graph.
Term
Speciation(explain)
Definition
Populations share a gene pool. A genetic change in one individual (if it increases fitness) can spread, over time through the population. That individuals and its offspring survive and pass on the allele for the trait until more and more of the population exhibit the trait.
Term
Vestigal Structures
Definition
Traces of organs or other body parts that no longer have a function but are present in others. Ex. appendix, tail bone.
Term
Gene Pool
Definition
All the genetic information from a population, all the different genes including alleles.
Term
Mutation
Definition
No effect: GGA and GGU code from the same amino acid.
Negative effect on fitness
Positive effect on fitness
Term
Fitness
Definition
The ability to survive and pass on your traits.
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