Week 5 - Genetics Worksheet
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Week 5 - Genetics Worksheet

Course Number: SCI 230, Spring 2012

College/University: University of Phoenix

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GENETIC WORKSHEET 1 Genetic Worksheet Mary Walden SCI/230 August 5, 2012 Jonathan Adams GENETIC WORKSHEET 2 Genetic Worksheet Cystic Fibrosis 1. According to the pedigree, is cystic fibrosis inherited as a dominant or as a recessive trait? Explain how you made your conclusion using evidence from the pedigree and the principles of genetics. According to the pedigree cystic fibrosis is passed from generation to...

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WORKSHEET 1 Genetic GENETIC Worksheet Mary Walden SCI/230 August 5, 2012 Jonathan Adams GENETIC WORKSHEET 2 Genetic Worksheet Cystic Fibrosis 1. According to the pedigree, is cystic fibrosis inherited as a dominant or as a recessive trait? Explain how you made your conclusion using evidence from the pedigree and the principles of genetics. According to the pedigree cystic fibrosis is passed from generation to generation as a recessive trait because it skips generations. This conclusion was reached because no one from Generation I was affected with the disease. However, in Generation II the first male was unaffected with the disease, but the second male was infected with the disease. This proves that it is passed as a recessive trait rather than a dominant trait. This is possible when both parents are hybrids for the trait; which means that they do not have the disease, but carry the gene. Children of two hybrid parents can inherit a recessive gene from each parent. Two recessive genes shows the cystic fibrosis disease. 2. What would a Punnett square that shows how the son in generation IV (marked with an A) inherited cystic fibrosis look like? C c Pedigree showing Inheritance of Huntingtons Disease C CC Cc c Generation Cc cc Key: male with Huntingtons Disease unaffected male female with Huntingtons Disease I Huntingtons Disease unaffected female 1. According to the pedigree, is disease Huntingtons inherited as a dominant or as a recessive II trait? Explain how you made your conclusion using evidence from the pedigree and the principles of genetics. III IV V After reviewing the pedigree the Huntingtons disease is a dominant trait because it does GENETIC WORKSHEET 3 not skip generations. Each offspring that has the disease has at least one parent that also has the disease. A hybrid child inherits a dominant gene from one parent and a recessive gene from the other. 2. What would a Punnett square that shows how the first daughter in generation II (marked with a B) did not inherit Huntingtons disease look like? h h H Hh Hh h hh hh 3. What is the role of chromosomes in the inheritance of genetic traits, such as cystic fibrosis and Huntingtons disease? Cystic Fibrosis Each person has two genes for every trait. We inherit one from each parent. We all have two copies of each gene or one on every chromosome in a pair. The gene pairs will show the trait. Huntingtons Disease A person only needs to inherit one gene for them to be affected by the disease. Since we receive two genes, one from each parent, one will be a dominant gene and the other would be a recessive gene. References Simon, E. J., Reece, J. B., & Dickey, J. L. (2010). Campbell essential biology with physiology GENETIC WORKSHEET (3rd ed.). San Francisco, CA: Pearson Benjamin Cumm 4

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