18 May 2010, Tuesday

18 May 2010, Tuesday - Lecture notes genetics 18 May 2010...

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Lecture notes genetics 18 May 2010 Genetic symbols Mendelian symbols Capital letter = dominant; A Lower case letter = recessive; a Drosophila melanogaster o Drosophila geneticists use different symbols than those used by Mendel o Wild type: the allele found in nature (most commonly) + is the wild type allele Lower case letter = mutant allele, which is recessive to wild type Upper case letter represents dominant allele, which is dominant to wild type o Representing chromosomes: Autosomes: v+/v Y chromosome is usually symbolized by Y or by a bent slash Chromosomal theory of inheritance 1. The chromosomal theory of inheritance states that a. The genes are located on the chromosomes and are arranged in a specific order b. The pattern of inheritance of a particular chromosome will determine the way in which the genes located on that chromosome are inherited. 2. Evidence and predictions a. Diploid organisms inherit a pair of alleles (maternal, paternal) at the time of fertilization a.i. Also inherit pair of homologous chromosomes b. Somatic cells of diploid organisms contain characteristic types, numbers of chromosomes (2n); gametes contain half that number c. Members of gene pairs segregate during gamete formation, are transmitted to different gametes
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18 May 2010, Tuesday - Lecture notes genetics 18 May 2010...

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