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SLS Bio 11 Evolution

TermDefinition
Complementary Base Pairing The pair of nitrogenous bases that connects the complementary strands of DNA or of double-stranded RNA
Convergent evolution convergent evolution is the process whereby organisms not closely related (not monophyletic), independently evolve similar traits as a result of having to adapt to similar environments or ecological niches
Divergent Evolution Divergent evolution is the accumulation of differences between groups which can lead to the formation of new species
Deoxyribonucleic Acid deoxyribonucleic acid, a self-replicating material present in nearly all living organisms as the main constituent of chromosomes. It is the carrier of genetic information.
Double helix a pair of parallel helices intertwined about a common axis, especially that in the structure of the DNA molecule.
Evolutionary Change a gradual change in the characteristics of a population of animals or plants over successive generations
Gene Flow is the transfer of alleles or genes from one population to another.
Genetic Drift variation in the relative frequency of different genotypes in a small population, owing to the chance disappearance of particular genes as individuals die or do not reproduce.
Gradual Change Model A model that shows that change happens really slowly over long periods of time
Mutation the changing of the structure of a gene, resulting in a variant form that may be transmitted to subsequent generations, caused by the alteration of single base units in DNA
Natural Selection the process whereby organisms better adapted to their environment tend to survive and produce more offspring
Nitrogenous Base A nitrogenous base is simply a nitrogen containing molecule that has the same chemical properties as a base
Non-random mating Nonrandom mating occurs when the probability that two individuals in a population will mate is not the same for all possible pairs of individuals.
Punctuated Equilibrium Model the hypothesis that evolutionary development is marked by isolated episodes of rapid speciation between long periods of little or no change.
Speciation the formation of new and distinct species in the course of evolution.
Sugar-Phosphate Backbone The sugar phosphate backbone is an important stuctural component of DNA. It consists of 5-carbon deoxyribose sugars and phosphate groups
Created by: colinwong
 

 



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