Bio 202 Fast Plants Report - Venosa Terreus December 10th...

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Venosa Terreus December 10 th , 2014 Dr. Bradbury Boyd Biology 202 Lab Report Investigating Mendelian Genetics with Wisconsin Fast Plants Introduction: The purpose of this experiment was to demonstrate how genotypes are influenced by phenotypes, and to test, observe, and examine Gregory Mendel’s 1 st Law of Segregation and 2 nd Law of Independent Assortment by using fast plants. Mendel’s Law of Segregation stated that during the production of gametes, two copies of each hereditary factor segregate so that the offspring will obtain one factor from each parent during fertilization . Mendel’s Law of Independent Assortment states that allele pairs separate independently during the formation of gametes , which allows traits to be transmitted to offspring independently (Campbell 2011). With this experiment we focused on the dihybrid cross of F1 generations. When P1 and P2 plants are cross-pollinated, it gave rise to the first generation (F1). The parent generation, 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 same two traits. The F1 generations have both the dominant and recessive alleles, thus making them heterozygous. When the F1 generations were self pollinated, it then, gave rise to the second 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 the F2 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 F2 generation we saw that the offspring had purple or green stems with green or yellow leaves. These characters are also independent of each other, meaning that one outcome does not affect the other. For the fast plants the green leaf is dominant over its recessive trait, which can be seen as yellow-green and as for the color of the stem, purple is dominant over the green. We let YGR represent the dominant allele for the green leaves

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