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SLSBio11 EvolutionAF

SLS Bio 11 Evolution AF

TermDefinition
Complementary base pairing The pairing of complementary nitrogenous bases between the two strands of the DNA molecule, between DNA and RNA, or between different segments of an RNA molecule. pairing: guanine-cytosine and adenine-thymine
convergent evolution the independent evolution of similar features in species of different lineages.
divergent evolution the accumulation of differences between groups which can lead to the formation of new species
deoxyribonucleic acid (DNA) a self-replicating material which is 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 gradual change in the characteristics of a population of animals or plants over successive generations
gene flow In population genetics, 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 States that biological change was slow and steady over time
mutation A change of the DNA sequence within a gene or chromosome of an organism resulting in the creation of a new character or trait not found in the parental type.
natural selection things that have more useful traits and/or fewer harmful ones (for a particular environment) have more surviving offspring than those that don't.
nitrogenous base A nitrogenous (nitrogen-containing) base is a nitrogen-containing organic molecule having the chemical properties of a base. A nitrogenous base owes its basic properties to the lone pair of electrons of a nitrogen atom.
non-random mating Any mating system in which males are not randomly assigned to females.
punctuated equilibrium model a theory in evolutionary biology which proposes that most species will exhibit little net evolutionary change for most of their geological history, remaining in an extended state called stasis.
speciation the formation of new and distinct species in the course of evolution.
sugar-phosphate backbone the major structural component of the DNA molecule. The backbone is constructed from alternating ribose sugar and phosphate molecules.
Created by: afraser2
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