Variation - alleles • Harmonia axyridis o Patterns...

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Gene 3000 03-01-07 Development of Evolutionary Biology (Dr. Anderson’s first lecture) Slide 15 Orthogenesis – straight line/direction/pathway (ex. Increase in size) Mutationism – evolution by big mutational steps Saltationism – evolution by jumps Neo-Lamarckism – inheritance of acquired characteristics Variation of Organisms and Its Genetic Basis Rare Variants: Elaphe guttata o Color acts as camouflage – presence of all colors is wild-type Black, orange, and albino mutants caused by recessive mutations Collinsia grandiflora o Albino mutants lack pigment and are susceptible to disease Mytilus edulis o Blue and brown (brown is dominant); there are no adaptive differences Clarkia amoena o Spotted from is dominant, both are found frequently in nature Pisaster ochraceus o Purple and orange, continuous variation may be present due to many
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Unformatted text preview: alleles • Harmonia axyridis o Patterns thought to be determined by multiple alleles of a single gene; pattern is correlated with geography • Foxglove o Colors are due to 3 genes, speckling is also present All other examples of variation are in the notes online Beak of the Finch Discussion (ch. 1-3) Why does the Origin of Species focus on pigeons, not finches? • Pigeons were available for Darwin to study, he knew pigeon breeders and he became one; Darwin thought that people would be more able to relate to pigeons than to finches Why are the Galapagos Islands good to study? • They are isolated • There are enough species and individuals to study, but not too many • The climate and geography is similar from island to island • “Infinite” variation (beaks) 1...
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