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SLS Bio11 Evolution GN

Complementary base pairing When the Nitrogen bases of T pair with A and G pairs with C. This happens through the hydrogen bonds
Convergent evolution When two species/organisms that are not closely related adapt to have similar traits. An example is a bat and a bird. One is a mammal and the other is a bird but they both are similar in the way that they can fly
Divergent evolution This is when a species evolves and branches out to different kinds of variations of that species. The birds of Galapagos Islands are an example of divergent evolution.
Deoxyribonucleic acid (DNA) A self replicating substance that is in every living organism. It holds genetic information and the coding for protein.
Double helix A double helix is the structure for a DNA molecule. It is described as a twisted ladder and divides to replicate DNA.
Evolutionary change When an allele frequency changes in a population. When a gene increases or decreases in popularity for a species. This can happen through natural selection and mutations.
Gene flow When an organism from one population immigrates into a new one and mates. This new organism would probably change the gene pool because of the unique traits that they brought in.
Genetic drift A random change in gene frequency that effects the population.
Gradual change model When a species gradually changes over time. The affects are slowly seen and appear more frequent over a long time.
Mutation A change in genetic sequence that affects the individual genetics. A mutation can be inherited or appear because of a random error in DNA sequence
Natural selection When the environment selects the most fit organisms to live. The organisms that are best adapted to the environment will survive and pass on their genes
Nitrogenous base The bases that are part of the nucleotide on the double helix. There are four bases. They are thymine, Adenine, Guanine, and cytosine. They pair together through hydrogen bonds
Non- Random mating When organisms look for traits in mates that will help them survive. An organism will select their potential mate based on their phenotypes.
Punctuated equilibrium model When a species changes and adapts in random short spurs. This is different than Gradual change because it does not happen over time.
Speciation When a new species is formed from another one because of natural selction
Sugar-phosphate backbone The back bone of DNA is a polymer that has four bases of A, T, C, and G
Created by: Graeme.N
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