ch1 - CHAPTER 1 PROBLEM SETS& INSIGHTS Solved Problems...

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Unformatted text preview: CHAPTER 1 PROBLEM SETS & INSIGHTS Solved Problems S1. A human gene called the CF gene (for cystic fibrosis) encodes a protein that functions in the transport of chloride ions across the cell membrane. Most people have two copies of a functional CF gene and do not have cystic fibrosis. However, there is a mutant version of the cystic fibrosis gene. If a person has two mutant copies of the gene, he or she develops the disease known as cystic fibrosis. Are the following examples a description of genetics at the molecular, cellular, organismal, or populational level? A. People with cystic fibrosis have lung problems due to a buildup of mucus in their lungs. B. The mutant CF gene encodes a chloride transporter that doesn’t transport chloride ions very well. C. A defect in the chloride transporter causes a salt imbalance in lung cells. D. Scientists have wondered why the mutant cystic fibrosis gene is relatively common. It is the most common mutant gene that causes a severe disease in Caucasians. Usually, mutant genes that cause severe diseases are relatively rare. One explanation why causes a severe disease in Caucasians....
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