HMB265H1 Chapter Notes - Chapter 2, 7, 14: Mutual Exclusivity, Dihybrid Cross, Lethal Allele
15 Jul 2018
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HMB265H1 Full Course Notes
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Genetics: the science of heredity : there exists genetic variation in populations, had to result in observable traits for mendelian experiments, variation inherited by some laws, not just chance, and exists in species, breeds, families, etc. Artificial selection: first exploitation of genetics by humans, i. e. for crops & animals. Blended inheritance: traits from parents mixed and forever changed in offspring. Garden pea: can self-fertilize, and is easy to cross-fertilize too (remove anthers to prevent selfing, many plants, short growing season, each pea forms from different pollen & ovules, f1 generation shows dominant trait (if discrete) Antagonistic pairs: constant traits that are mutually exclusive i. e. either/or traits. Monohybrid cross: two versions of one trait: disproved blending when old trait re-appeared in f2 generation (genetic info. not lost, one gene from mom, one from dad, two alleles explained re-appearance of traits and recessiveness. Law of segregation: alleles segregate in gamete formation, come together at random at fertilization.
