Week 6 Mendelian and Molecular Genetics

Week 6 Mendelian and Molecular Genetics - Mendelian and...

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Mendelian and Molecular Genetics Mendelian and Molecular Genetics | Conclusion | Practice Quiz Please note , all words that are bold are rollovers that will display additional text in the form of a pop-up box. Mendelian and Molecular Genetics The first person to systematically study inheritance and formulate laws describing how characteristics are passed from one generation to another was Gregor Mendel (1822-1884). Mendel's work was not generally accepted until after his death. The laws formulated by Gregor Mendel are called Mendelian genetics. Genes are units of heredity composed of specific lengths of DNA that determine the characteristics an organism displays. Specific genes are at specific loci ( locus ) on specific chromosomes. The phenotype displayed by an organism is the result of the effect of the environment on the ability of the genes to express themselves. Diploid organisms have two genes for each characteristic. The alternative forms of genes for a characteristic are called alleles as shown in the following photo, (the photo on the left is an attached earlobe and the photo on the right is a free earlobe). There may be many different alleles for a particular characteristic. Organisms with two identical alleles are homozygous for a characteristic; those with different alleles are heterozygous . Some alleles are
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This note was uploaded on 12/01/2009 for the course SCI 214 taught by Professor Bodus during the Spring '09 term at DeVry Cincinnati.

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Week 6 Mendelian and Molecular Genetics - Mendelian and...

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