CAS AN 102 Study Guide - Final Guide: Meiosis, Allele, Chromosome

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Studied common pea plant and discovered each has two true breeding alternative forms. Allowed f1 to self fertilize and found 3/4 were tall and 1/4 were short. Suggested that expression of traits controlled by discrete, particulate units. Realized that expression of short plants had not disappeared but was masked. Particles must come in pairs with offspring inheriting one from each parent. Pairs must separate into different sex cells and unite at fertilization (meiosis) Found that two traits weren"t inherited together but sorted independently. Distribution of one pair of alleles into gametes does not affect the distribution of another pair. Blended inheritance: idea that each parental contribution is halved at each generation. Locus: location on a chromosome where homologous genes are located. Allele: alternate form of the dna sequence at a locus (gene) Heterozygous: having two different alleles at one locus. Homozygous: having the same alleles at a particular locus.

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