BIOL207 Lecture Notes - Lecture 2: The Extended Phenotype, Reaction Norm, Nucleic Acid Double Helix
10 Sep 2016
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Figure: preformed humans present in sperm: dna, genotype, and phenotype. Three-dimensional structure: information: encodes the characteristics of an organism, replication: can be copied, transmission: is passed from parents to offspring during reproduction, variation: subject to occasional modifications that result in differences between indi- viduals. Different forms of the same kind of information exist: alleles and polymorphisms. Different genotypes: example of a sequence different between maternal and paternal chromo- some. Phenotype: the form taken by some character (or group of characters) in a specific individual (eg. high bp due to genetic or environment factor) (observation) *doesn"t care if its genetic or not. =>definition 1 doesn"t necessarily refer to a genotype: see next slide. Argues that phenotypes should not be limited to organisms traits. Beaver dams, termite mounds: extended phenotype, in the gene of animal to do these things, natural biology. Two genetically identical individuals may have drastically different appearance. This is typically caused by environment differences.
