BIOL 110 Chapter Notes - Chapter 14: Somatic Cell, Sickle-Cell Disease, Environmental History
Document Summary
Concept 14. 1 mendel used the scientific approach to identify two laws of inheritance. Mendel"s experimental, quantitative approach: character - a heritable feature that varies among individuals, trait - each variant for a character, pea advantages. Cross- pollination: true-breeding, hybridization - the mating or crossing of two true-breeding varieties. The law of segregation: ratio of 3:1, purple was the dominant trait, white was the recessive. Proven by the white flowers reappearing in the f2 generation: seed shape also follows this dominance pattern. Mendel"s model: alternative versions of genes account for variations in inherited characteristics. Dna sequence variations: for each character, an organism inherits two copies of a gene, one from each parent. Genetic locus is represented twice in a diploid cell. 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.
