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21 Cards in this Set

  • Front
  • Back
thomas huxley
coined the word agnosticism; started the journal Nature, and founded the X-club a secret society of Darwins supporters
gregor mendel
discovered the mechanism of heredity; showed that: the physical units of heredity came in pairs, one unit from each parent, herdity was particulate, not blending of fluids, and variation was not continuous but discontinuous
theodosius dobzhansky
translated the complex models of population genetics into terms the field biologists could understand
geographic isolation
small isolated populations often developed distinctive genetic differences; speciation (formation of new species) requires this
blended heredity
darwin believed that the gemmules moved to the reproductive organs during sex; that this was a gradual and continuous process
tiny particles that carried the information of heredity
alleles are different versions of the same genes; original and mutated form
dominant allele
large letter; example= W over w
recessive allele
little letter; example is w over W
2 different genes
2 similar genes
changes in genetic information
modern synthesis
fusion of abstract models of genes moving through populations, with the population perspective of field biologists
mendel showed that this was continunous rather than darwin's belief of discontinuous
group of species
geneticists discovered that this meant a change in gene frequency over time
groups of local populations that varied from one another
formation of new species; requires geographic isolation
darwins theory of evolution by natural selection
active and creative force
biological species concept
species are populations of similar organisms that can interbreed with one another, but are reproductively isolated from other such populations by one or more isolating mechanisms
Darwins bulldog
T.H. Huxley