BIOL 1020 Chapter Notes - Chapter 17: Small Nuclear Rna, Start Codon, Neurospora Crassa
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BIOL 1020 Full Course Notes
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For example, mendel"s dwarf pea plants lack a functioning copy of the gene that specifies the synthesis of a key protein, gibberellin. Gibberellins stimulate the normal elongation of stems. Concept 17. 1 genes specify proteins via transcription and translation. The study of metabolic defects provided evidence that genes specify proteins: in 1909, archibald gerrod was the first to suggest that genes dictate phenotype through enzymes that catalyze specific chemical reactions in the cell. He suggested that the symptoms of an inherited disease reflect. They bombarded neurospora with x-rays and screened the survivors for mutants that differed in their nutritional needs. Beadle and tatum concluded that this mutant was defective somewhere in the biochemical pathway that normally synthesizes arginine. They identified three classes of arginine-deficient mutants, each apparently lacking a key enzyme at a different step in the synthesis of arginine. They demonstrated this by growing these mutant strains in media that provided different intermediate molecules.