Mendelian Genetics Lab Report

Decent Essays
Introduction to Mendelian Genetics
BYS 119L-16
Kira White
Lab 11
Karsyn Seals

All living things contain DNA which contains genes. These genes determine our physical appearance and how the body functions. “Phenotype” refers to the physical characteristics inherited from parents and “genotype” is determined by the alleles present in a gene. There are two types of genotypes, homozygous and heterozygous, and there are two types of genes, dominant and recessive. Dominant genes are those whose alleles are represented by a capital letter and recessive are represented by a lowercase. The gene “Bb” is a heterozygous dominant gene, and “bb” homozygous recessive. Gregor mendel is the father of the modern study of genetics.
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This was done for both the monohybrid cross of the pea plants and the dihybrid cross of the corn cob to determine whether the crosses follow the 3:1 (monohybrid) and the 9:3:3:1 (dihybrid) phenotypic ratios. The degree of freedom was then found by subtracting 1 from the amount of phenotypes. Degree of freedom can be described as “a box containing three marbles” (Stallsmith). Each of these marbles is a different color, so there is only two degrees of freedom, “two trials in which chance can operate” (Stallsmith). Using the chart on page 69 of the lab manual, and the degree of freedom, it was determined whether the chi squared deviated significantly or insignificantly. The chi squared of the pea plants had a deviation that would be considered insignificant, between 0.2 and 0.1 and the chi square of the corn cob had an insignificant deviation between 0.8 and 0.7. The results support the original hypothesis for both of the crosses, they follow Mendel's laws. Something that could be changed about this experiment is a more accurate way to count the corn kernels, as human error could have skewed the results. This experiment is significant because genetics is a critical field of study in determining why organism looks the way the do and how traits
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