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Venosa TerreusDecember 10th, 2014Dr. Bradbury Boyd Biology 202 Lab ReportInvestigating Mendelian Genetics with Wisconsin Fast PlantsIntroduction: The purpose of this experiment was to demonstrate how genotypes are influencedby phenotypes, and to test, observe, and examine Gregory Mendel’s 1stLaw ofSegregation and 2ndLaw of Independent Assortment by using fast plants. Mendel’s Lawof Segregation stated thatduring the production of gametes, two copies of each hereditaryfactor segregate so that the offspring will obtain one factor from each parent duringfertilization. Mendel’s Law of Independent Assortment states thatallelepairs separateindependently during the formation ofgametes, which allows traits to be transmitted tooffspring independently (Campbell 2011). With this experiment we focused on the dihybrid cross of F1 generations. WhenP1 and P2 plants are cross-pollinated, it gave rise to the first generation (F1). The parentgeneration, P1 and P2, plants were true-breeding homozygous for two traits. One plant,P1, was dominant for both traits while the second plant, P2, was recessive for the sametwo traits. The F1 generations have both the dominant and recessive alleles, thus makingthem heterozygous. When the F1 generations were self pollinated, it then, gave rise to thesecond generation (F2). The F2 generation represents all the genotypes existing in the P1,P2 and the F1 plants. The goal of the experiment was to determine the phenotype of theF2 generation and whether the recessive traits of the offspring appear in the F2
generation. These two characters were the leaf color and the stem color. In the F2generation we saw that the offspring had purple or green stems with green or yellowleaves. These characters are also independent of each other, meaning that one outcomedoes not affect the other. For the fast plants the green leaf is dominant over its recessivetrait, which can be seen as yellow-green and as for the color of the stem, purple isdominant over the green. We let YGR represent the dominant allele for the green leaves