Mendelian Genetics - Mendelian Genetics A Gregor Mendel...

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Mendelian Genetics A. Gregor Mendel- worked with Peas (Pisum sativum) 1. Principle of dominance a. every trait has 2 factors (genes) b. dominant is expressed c. recessive is not expressed 2. Principle of segregation a. Every trait is governed by 2 genes, during Meiosis each gamete gets 1 of these genes. 3. Principle of independent assortment a. genes for each trait are sorted independently from genes of another trait in gametes.
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B. Mendel’s Experiment 1. True breeding lines a. always produced offspring with same characteristics 2. Parent Generation (P) a. Crossed contrasting traits 3. First filial Generation (F 1 ) a. would get all dominant phenotype
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b. crossed F 1 with F 1 4. Second Filial Generation F 2 a. offspring of F 1 -F 1 cross b. 3 to 1 ratio of dominant to recessive C. Patterns 1. Principle of dominance a. each trait is governed by 2 genes, the gene that is expressed is dominant, the gene that wasn’t expressed is recessive 2. Principle of Segregation a. Each trait is governed by 2 genes, The gamete gets 1 gene D. Chromosome Terminology 1. Chromosome- 1 molecule of DNA, 23 pairs (egg, sperm), 46 chromosomes
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2. Homologous- 23 pairs of chromosomes similar in size, shape, and genetic information 3. Genes- set of instructions, sequence of nucleotides
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This note was uploaded on 04/07/2008 for the course BS 131 taught by Professor Smith during the Spring '08 term at University of the Sciences in Philadelphia.

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Mendelian Genetics - Mendelian Genetics A Gregor Mendel...

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