ANTH 225 Chapter Notes - Chapter 4: Genetic Drift, Chromosome, Pleiotropy
24 Oct 2017
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Document Summary
Introduction it wasn"t until the 20th century that scientists discovered how selective breeding could increase the frequency of desirable characteristics living in an abbey already studied botany. Mendel let the f1 plants self-fertilize to produce the f2 generation (3/4 tall; 1/4 short) different expressions of a trait were controlled by discrete units (genes) occurring in pairs and that offspring inherited one unit from each parent. Mendel"s results" significance was overlooked and a unappreciated. Mendelian traits aka discrete traits - controlled by alleles at either one genetic locus or two or more very closely linked genetic loci. Many recessive alleles actually do have some affect on the phenotype in heterozygotes, the products of many recessive alleles are reduced but not completely eliminated. Mendelian traits aka discrete aka discontinuous - phenotype expressions don"t overlap. Melanin production is influenced by interactions between several different loci that have now been identified.
