Chapter 14

Chapter 14 - Chapter 14 Mendel and the Gene Idea Mendelian...

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Chapter 14 – Mendel and the Gene Idea - Mendelian Genetics o Character Heritable feature Ex. Fur color o Trait Variant for a character Ex. Brown o True-bred All offspring of same variety Their traits were the same All offspring the same o Hybridization Crossing of 2 different true-breeds o P generation (parents) True breading plants o F1 generation (first filial generation) o F2 generation (second filial generation) 3:1 phenotypic ratio 3 = dominate trait 1 = recessive trait Phenotypic = physical - Leading to the Law of Segregation: 2 alleles separate during mitosis o Alternative versions of genes (alleles) account for variations in inherited characteristics o For each character, an organisms inherits 2 alleles, one from each parent o If the two alleles differ, then one, the dominant allele is fully expressed in the organisms appearance The recessive alleles, has no noticeable effect on the organisms appearance. o
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This note was uploaded on 10/31/2011 for the course BIO 102 taught by Professor Robinson during the Spring '09 term at UPenn.

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Chapter 14 - Chapter 14 Mendel and the Gene Idea Mendelian...

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