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18 complete complete dominance incompletepartial

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Unformatted text preview: erozygotes. heterozygotes. • Codominance means that both proteins are equally effective in the cell (distinct phenotypes of both alleles are observed). 18 Complete Complete Dominance, Incomplete/Partial Dominance & Codominance Dominance Codominance Relationship Heterozygote Protein Genotype Expressed in Heterozygote Heterozygote Phenotype Complete Dominance (A is the Dominance (A is the dominant dominant allele) Aa Protein ‘A’ and Protein ‘a’ Full effect of ‘A’ Incomplete (Partial) Dominance Dominance (no dominant allele) Aa Protein ‘A’ and Protein ‘a’ Intermediate or blended half effect of ‘A’ and half effect of ‘a’ Codominance Codominance (both A and a are dominant alleles) Aa Protein A and Protein ‘a’ Full effect of ‘A’ and full effect of ‘a’ See IVLE animations 19 What What and where is the genetic material? Evidence linking nucleus and DNA as a source of hereditary/genetic material (four sets of experiments) 20 1. Hammerling’s Hammerling’s acetabularia experiment Nucleus contains genetic genetic information that directs cellular development 21 2. 2. Griffith’s Transformation Experiment Heat‐killed the S cells but did not destroy their genetic material (including the part that cause infection). This material was transferred from dead S cells to living R cells. 22 3. 3. Avery & colleagues experiment demonstrated demonstrated that DNA is the transforming material material Cell extract Protein, RNA, DNA (other stuff) (other stuff) 23 4. Hershey & Chase Chase experiment Is it Protein or DNA Is it Protein or DNA The Genetic Material? 24 Summary Summary of the Hershey Chase Hershey & Chase experiment experiment demonstrating that DNA not protein is DNA, not protein, is responsible responsible for directing the reproduction reproduction of phage T2 during the infection of E. coli. E. Phosphorus are found are found only in viral DNA Sulfur are found only are found only in viral Protein 25 How How much of DNA and RNA (nucleic acids) are found in a cell? are found in cell? Nucleic Acids 26 Plant cell Plant cell (eukaryote) Animal cell (eukaryote) Where in the cell are DNA found? Bacteria (prokaryote) 27 Check out: Learn Check out: Learn...
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This note was uploaded on 03/21/2013 for the course GEK 1527 taught by Professor Tan during the Winter '11 term at National University of Singapore.

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