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Genetic Observations Through The Studies Of Hybrid Corn, Single Gene Human Trait
and Fruit Flies The basic foundation of modern genetics was led by Gregor Mendel (Corcos, 1993). Mendel was not the first to experiment with heredity, and our Lyman Briggs biology class will not be the last to deal with genetics. Genetics is the science of heredity. In our lab, we had three main objectives. First, we evaluated our data on monohybrid and dihybrid corn cross seed counts against Mendel’s theoretical expectations of independent assortment and the segregation of alleles. Next, we used the Hardy-Weinberg Theorem to provide a theoretically expected value for allele frequencies for single human gene traits. Lastly, we dealt with Drosophila melanogaster and we examined red and white eye alleles to determine if this gene is sex-linked or autosomal. During the mid 1800’s Mendel bred garden peas to study inheritance. He choose these plants because of their well defined characteristics and the ability to be grown and crossed (Campbell, 1996). Mendel wanted to know the genetic basis for variation among individuals and what accounted for the transmission of traits from generation to generation. Mendel followed traits for the P generation, F1 generation, and F2 generation. The P generation is the original true-breeding parents. Their hybrid offspring is the F1 generation, the first filial. The F2 generation is the second filial and is the self- pollination of the F1 hybrids. It was predominantly his research on the F2 generation that led to Mendel’s Law of Segregation and Law of Independent Assortment (Campbell, 1996). Mendel’s Law of Segregation states that alleles sort into separate gametes. He formed this through performing monohybrid crosses. The F2 generation will have a 3:1 phenotypic ratio. By considering more than one trait Mendel formed his Law of Independent Assortment. He questioned whether traits were inherited independen... Please login to view comments from other users.
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