BIOL 202 Lecture Notes - Mutagen, Animal Testing, Radiography
21 May 2012
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Document Summary
Phenotypes come from the interaction between alleles within genes, and also between different genes for biochemical, developmental and signalling pathways. Complete dominance can be seen in recessive mutations, which we have seen before, at the molecular level. The homozygous wild type has two dominant alleles, which means that each chromosome can create a fully functional protein, resulting in full function. The homozygous recessive individual is the only one with a different phenotype because it has none of the function protein because both loci are mutated. Incomplete dominance can be seen in two instances; either with haploinsufficieny or with dominant negatives. The red flowers have 2 doses (ww), meaning they made two doses of color pigment, while the ww plants make none, resulting in the white color. The bad protein wraps itself around the wild type and prevents the proper folding, which leads to improper function.
