Mendelian Genetics Lab Report Essay - 817 Words

Lab Report: Mendelian Genetics Introduction: In 1866 an Austrian monk, Gregor Mendel, presented the results of painstaking experiments on the inheritance patterns of garden peas. Those results were heard, but probably not understood, by Mendel’s audience. Now, more than a century later, Mendel’s work seems elementary to modern–day geneticists, but its importance cannot be overstated. The principles generated by Mendel’s pioneering experimentation are the foundation for genetic counseling so important today to families with health disorders having a genetic basis. It’s also the framework for the modern research that is making inroads in treating diseases previously believed to be incurable. In this era of genetic engineering the†¦show more content†¦Then determine the ratios in which each of the character traits is found and also what possible genotypes the parents might be.(stallsmith) Results: Part A- Observed Ratios of Green to Albino Seedlings # of green seedlings #of Albino seedlings Ratio of green to albino seedlings 71 18 3:1 ~1~3 0.83.1, 3:1 Total: 89 This graph shows that there is a 3:1 ratio of green to albino seedlings. There were 71 green seedlings, and 18 albino seedlings, with a total of 89 seedlings. Part B- Dihybrid Cross (F2 progeny) #purple starchy (smooth)|#purple sweet (wrinkled) | #yellow starchy (smooth)|#yellow sweet(wrinkled) 182 67 115 43 Genotypes of purple starchy | of purple sweet | of yellow starchy | of yellow sweet PPSs, PpSS, PpSs,PPSs PPSs, Ppss, PpSS, PPss PpSs, ppSs, PpSS, ppSS PpSs, PPSs, Ppss, ppss Possible genotype of P1 | genotype of F1 | ratio of F2 phenotypes| ratio of F2 genotypes PPSS PpSs 9:3:3:1 1:2:2:1 This table helps show all the possible genotypes from one set of parents. The table shows that the genotypes purple and starchy are dominant, and the genotypes yellow and sweet are recessive.(stallsmith) Discussion: Part A- For every albino seedling there will be three green seedlings. 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