Set: Evolution

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All 22 Terms

Term Definition
Adaptive Radiation when a large number of species form to occupy different ecological niches
allopatry speciation as a result of geographical isolation
co-evolution when one species or group changes its genetic compostion in response to a genetic change in another
convergent evolution when different species living in the same environment come to look similar
directional selection when one extreme is selected for
disruptive selection where both extremes are selected for against the middle range. This ultimately produces two new species
divergent evolution when one species branches to form two or three species
gene pool all the genes in a reproducing population
genetic drift random changes in allele frequencies because of small population size
genome the genetic makeup of an individual
gradualism slow changes between populations that occur as a result of different selection pressures
isolating mechanism any mechanism that prevents interbreeding of hybrids
polyploidy when cells have more than 2n chromosomes. Polyploidy is common in plants
punctuated equilibrium where evolution consists of long periods of stability followed by short rapid changes as a result of critical selection pressures
race a group of individuals of a species that have many features in common
selection pressure the environmental factors that favour certain phenotypes
speciation a mechanism by which a new species is formed
species a group of individuals with common features and ancestry that will interbreed
selection for the middle range against the extremes stabilising selection
subspecies groups that are very different from each other but can still interbreed. subspecies develop from races and the differences are more extreme
sympatry speciation within the same area by natural selection. There are a number of niches and groups move into the niches best suited to them
parallel evolution two related species (common ancestor) independantly evolve similar structures

Set Information

Terms 22
Creator rgresson
Created November 2, 2007
Groups None
Subjects speciation, evolution, biology, animals
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Description

Keywords from Level 3 Biology Evolution course

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rgresson : Changed parallal evolution → two related species (common ancestor) independantly evolve similar structures to parallel evolution → two related species (common ancestor) independantly evolve similar structures
rgresson : Changed isolating mechanisms → any mechanism that prevents interbreeding of hybrids to isolating mechanism → any mechanism that prevents interbreeding of hybrids
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Most Missed Words

  1. allopatry → speciation as a result of geographical isolation - 2 misses
  2. isolating mechanism → any mechanism that prevents interbreeding of hybrids - 2 misses
  3. selection for the middle range against the extremes → stabilising selection - 2 misses
  4. convergent evolution → when different species living in the same environment come to look similar - 1 miss
  5. directional selection → when one extreme is selected for - 1 miss
  6. disruptive selection → where both extremes are selected for against the middle range. This ultimately produces two new species - 1 miss
  7. polyploidy → when cells have more than 2n chromosomes. Polyploidy is common in plants - 1 miss