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Download Notes The Work of Gregor Mendel Mendel studied 7 different pea
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Notes The Work of Gregor Mendel Mendel studied 7 different pea plant traits. A trait is a characteristic that varies from one individual to the next, i.e. plant height. Each trait had 2 contrasting forms, i.e. tall or short. Today, scientists call the chemical factors that determine traits genes. The different forms of the gene are called alleles. 1. The Principle of Dominance: states that some alleles are dominant and others are recessive. If an organism carries a single dominant allele, it will exhibit the trait. In order for the organism to show a recessive trait, the organism must have 2 copies of this allele. 2. The Principle of Segregation: states that alleles are segregated (separated) from each other so that each gamete carries only a single copy of each gene. 3. The Principle of Independent Assortment: states that genes for different traits can segregate independently during the formation of gametes.