Biology 2581B Study Guide - Midterm Guide: Null Allele, Stop Codon, Nonsense Mutation
18 Feb 2014
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Most human traits do not have 2 opposing phenotypes. Many traits don"t have a definitive dominance or recessiveness. Some traits turned out to be multifactorial ie. determined by two or more genes, or the interaction of genes with the environment. This occurs when the hybrid does not resemble either pure-breeding parent. F1 hybrids that differ from both parents often express a phenotype that is intermediate between those of the pure parents. Flower colour is the best example of incomplete dominance. A cross between pure-bred red and pure-bred white snapdragons always produces f1 offspring with pink petals. This is the result of each allele contributing a specific protein in pigment production. In eukaryotes transcription takes place in the nucleus and translation takes place in the cytosol. In prokaryotes, both transcription and translation occur in the open intracellular space. The rate of translation is often due to the rate of transcription.
