BIOL 222 Lecture Notes - Lecture 3: Gregor Mendel, Phenotype, Zygosity

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Biol 222 lecture 3 basic principles of heredity. The father of genetics: gregor mendel (1850"s 1860"s) Conducted quantitative and systematic studies of inheritance with peas. Individual pea plants produce both pollen and eggs, therefore they can both self-pollinate as well as cross-pollinate. Self-pollinate pollen and egg from the same flower combine in order to produce a fertilized seed; both parents have the same genotype. Cross-pollinate pollen and egg come from different plants; may have same or different genotype. Pure line all offspring produced by self or cross pollination have the same phenotype because they have the same genotype. Mendelian analysis analyzing heredity information using his techniques and principles: p parental generation. Individuals in first cross: f1 first filial generation. Progeny from first cross: f2 second filial generation. Monohybrid cross (p) pure round seeds (rr) x pure wrinkled seeds (rr) (f1) all round seeds. F1 (rr) x f1 (rr) (f2) 3:1 ratio of round:wrinkled. Phenotypic ratio 3:1 genotypic ratio rr:2rr:rr.

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