BIOL 1000 Chapter Notes - Chapter 10: Chromosome, Abo Blood Group System, Antibody
15 Dec 2013
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Prior to mendel, believed in blending theory of genetics. Hereditary traits blend evenly in offspring through mixing of parents blood. Doesn"t explain why extremes are not present (really short, really tall) Mendel observed many parental traits appear unchanged in offsprings. Choose pea plants that were able to true breed. Able to self fertilize, without any changes in traits in the next generation. First hypothesis: plants carry a pair of factors that governs inheritance of each: genes for genetic characters occur in pairs, each character of an organism inherits 1 chromosome with genes from each parent. Third hypothesis: two alleles (chromosome) of a gene separate and enter gametes as single alleles: fusion of haploid maternal and paternal cell create diploid, one allele of the same character is inherited from each parent. The product rule: event a and b of occurring: multiplication. The sum rule: event a or b of occurring: addition. Fourth hypothesis: independent assortment: allows for genetic variability.
