BIOL 1103 1st Edition Lecture 14 Outline of Last Lecture I Meiosis and human sexual life cycle II Chromosomes III Crossing over and Recombination IV Independent assortment V Nondisjunction Outline of Current Lecture II Mendel and His Experiments III Dihybrid Crosses involving Two Characters IV Probability V Reception of Mendel s ideas VI Incomplete Dominance and Co dominance Current Lecture Gregor Mendel 1822 1884 o father of genetics o Experimented with pea plants o Studies life cycle of a pea and cross pollination o life cycle These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute o cross pollination o Mendel found that the genes carrying the characteristics of the peas are found on chromosomes o Mendel then experimented with a dihybrid cross which is cross pollinating with two or more characteristics o Probability law of addition PP Pp which is 1 4 pp o o Probability of any two events happening is the product of each of their respective probabilities Reception of Mendel o Mendel attempted to publish his work but it was never given any real credibility until sixteen years after his death when scientists discovered meiosis and began to realize that Mendel was on to something Incomplete dominance o Is when neither allele for a given gene is completely dominant with the result that heterozygous genotypes can yield an intermediate phenotype Co dominance o In some instances differing alleles of the same gene will have independent effects in a single organism o Such is the case with the gene that codes for the type A and B glycolipids that extend from the surface of human red blood cells o An individual who has one A and one B allele will have type AB blood In such a situation neither allele is dominant rather each is having a separate phenotypic effect
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