lecture 15 - Mendelian Genetics Patterns of Inheritance...

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Mendelian Genetics “Patterns of Inheritance” Extending Medelian Genetics o Incomplete dominance Hererozygous phenotype Is intermediate between two parents Ex: blending of the two colors Red and White makes Pink varying in the production of proteins, both genes get transcribed but one of them the dominant one makes more protein. F1: blending F2 generation: 1:2:1 phenotypic ratio 1 (dominant), 2(blending), 1(recessive) o Codominance Human blood types: The gene located on chromosome 9 Three alleles I A , I B , i (4 types: A, B, AB, O) Based on markers on red blood cells. [Blood Type] 1. A (IA IA, IA i) a. anti B antibodies, cannot get blood from B 2. B (IB IB, IB i) a. anti A antibodies, cannot get blood from A 3. AB (IA IB) = universal recipient a. none, can get blood from A n B 3. O (ii) = universal donor a. anti A and anti B antibodies, can’t get from A or B o Polygenic inheritance( the bell curve) When alleles at more than one locus contribute to the same trait Ex: skin color and human height and intelligence
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This note was uploaded on 10/20/2011 for the course BIO 311 D taught by Professor Zhao during the Fall '08 term at University of Texas.

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lecture 15 - Mendelian Genetics Patterns of Inheritance...

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