Chapter 14 Notes 14.1 Mendel used the scientific approach to identify two laws of inheritance 1. Mendel’s Experimental, Quantitative Approach a. Character is a heritable feature that varies among individuals. b. Trait is each variant for a character. 2. Mendel’s Model a. First, alternative versions of genes account for variations in inherited characters ( alleles) b. Second, for each character, an organism inherits two alleles, one from each parent. c. Third, if the two alleles at a locus differ, then one, the dominant allele , determines the organism’s appearance; the other, the recessive allele , has no noticeable effect on the organism’s appearance. d. The law of segregation states that the two alleles for a heritable character segregate during gamete formation and end up in different gametes. 3. Law of Independent Assortment a. Law of independent assortment: Each pair of alleles segregates independently of each other pair of alleles during gamete formation.
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