Chapter 14 Notes

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

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Chapter 14 Mendel and the Gene Idea General Mendel discovered the basic principles of heredity by breeding garden peas in carefully planned experiments He was a Augustinian monk Started around 1857, with his study of inheritance Two Laws of Inheritance Character- a heritable feature that varies among individuals, such as flower color Trait- each variant for a character, such as purple or white flower color Peas plants o Short generation time o Large number of offspring per mating o Strictly controlled matting between plants o He tracked the flower color, purple or white True breed- over many generations of self-pollination had produced only the same variety as the parent plants Hybridization- the crossing of two true breeding varieties P generation- parent generation F1 generation- their offspring F2 generation- the following offspring from the F1 Law of segregation o Dominant- expressed when present o Recessive- expressed only with the absence of the dominate trait o Normally a 3:1 ratio o Alternative versions of genes account for variation in inherited characters o Alleles- the genes, DNA Inherits two alleles, one from each parent o Law of Segregation The two alleles for a heritable character segregate during gamete formation and end up in different gametes 50% dominate allele and 50% recessive alleles in the gametes
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This note was uploaded on 04/26/2009 for the course BIOL 111 taught by Professor Rizzo during the Spring '07 term at Texas A&M.

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

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