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