Mendel developed a hypothesis to explain these results that consisted of four related ideas. We will explain each idea with the modern understanding of genes and chromosomes. 1. Alternative versions of genes account for variations in inherited characters. o The gene for flower color in pea plants exists in two versions, one for purple flowers and one for white flowers. o These alternative versions of a gene are called alleles. o Each gene resides at a specific locus on a specific chromosome. o The DNA at that locus can vary in its sequence of nucleotides. o The purple-flower and white-flower alleles are two DNA variations at the flower-color locus. 2. For each character, an organism inherits two alleles, one from each parent. o A diploid organism inherits one set of chromosomes from each parent.
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This note was uploaded on 01/04/2012 for the course BSC BSC1005 taught by Professor Orlando,rebecca during the Fall '10 term at Broward College.