Phenotype

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    It has been proven that yeast can grow on both YPD and SD plates. In this lab we cross several yeast strains through the process called replica plating. For this identification test only one dominant allele is required. One copy of each gene is essential to produce enough of each enzyme needed in order to make a histidine. Through the study of Saccharomyces cerevisiae we prove that by transferring yeast cells onto YPD and SD plates over a period of 24-72 hours in a thirty degrees Celsius…

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    value of 13.241 is larger than the table X² value of 3.84 (df=1 & p=.05), therefore the observed distribution of purple and green stems is significantly different from the distribution expected under Mendel’s Law of Segregation which predicts the phenotype ratio of three purple stems to one green stem plants (ratio: 3:1). I also have to reject the null dihybrid hypothesis because the calculated x² value of 12.015 is more than the table X² value of 7.82 9df=3 & p=.05). The observed distribution…

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    Many phenotypes are possible due to the interactions of several alleles available in polygenic inheritance (Bailey, 2017). Polygenic traits exhibit incomplete dominance and Mendelian traits which exhibit complete dominance (Bailey, 2017). The phenotypes which arise from the polygenic inheritance is a mixture of each parent allele (Bailey, 2017). If the polygenic traits were to…

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    Chapter 2: The Beginning From Conception to Birth, first talks about how our life begins. Every human being starts with a single cell called zygote. (Berger, pg48). All living things consists of cells that has molecules of DNA. DNA molecules are called chromosomes. Then, this chromosomes contain genes. Each one of us has 46 chromosomes that are arranged into 23 pairs. Except for our reproductive cell called gamete. There are two different types of gametes, for a man it is called sperm and for…

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    1. Is it true that a homozygous dominant father and a homozygous recessive mother could give birth to a homozygous recessive child with the disorder phenotype? Explain. From the information provided, it can be determined that this statement is not true, as the offspring of this couple will not be homozygous recessive for the given trait. As both of the parents are homozygous for their respective alleles, every child would receive an allele from each parent, one being dominant (D) and the other…

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    Genetic Reflection Paper

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    Gene deactivation is essentially gene suppression, which is another topic I learned in class. Gene suppression is described as a second gene blocking the mutant phenotype of the second gene. Through suppression, the phenotypic ratio of progeny resulting from a cross between two heterozygotes is altered from a 9:3:3:1 ratio that is generally expected. The example of such a cross provided in class allowed me to understand…

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    Week 3 Assignment

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    Inversions and reciprocal translocations do not usually cause a phenotypic effect because of the person who is possessing these are able to equal the look alike numbers genetic components as a ordinary person. They would be able to possess a regular phenotype. It is also possible that the disengagement of the position of the chromosomes was able to influence the gene that was attempting to be expressed. 3. A woman who is…

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    This article was written in response to the 1990 US Census, in which they asked parents of biracial children to check the single race box. The researchers wanted to know, the reason behind each parent’s choice. For their mixed-race sample data, they used the three most common racially mixed household types (Asian-white, black-white and Latino-white). For their geographic area, they used the twelve major cities with the largest multiracial population. To get detailed information about each…

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    All species have variation which can lead to natural selection. Those organisms that are best fit for their environment survive, reproduce, and pass on their genes to their offspring. Over time the genotypes (and therefore phenotypes) of a population can change to reflect the beneficial genes that have accumulated in that population. Students will also develop their graphing skills through the data presentation portion of the lab. There is a scenario that students must use to define important…

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    leading causes of nosocomial infections. Infection with this pathogen can lead to a range of disorders from relatively mild skin infections to life threatening illness such as osteomyelitis. The ability of S. aureus to control expression of a virulent phenotype according to environmental conditions is regulated by the agr QS pathway [1]. Many of the factors involved in virulence, such as exotoxin production, as well as products associated with the formation of biofilm have been shown to be…

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