1 .		As discussed in the chapter, various genetic characteristics or traits follow simple inheritance patterns. Mendel’s principles can also be applied to the inheritance of certain diseases, as well. Our understanding of DNA and genetics has allowed scientists to develop genetic tests to determine the potential risk for developing various genetically based diseases. Using the links above, answer the following questions: How many known genetic diseases are inherited as a single gene, following the patterns of inheritance established by Mendel? Why is it difficult to develop genetic tests capable of detecting polygenic traits? Why is genetic counseling so important when performing genetic testing for patients?   To create paragraphs in your essay response, type <p> at the beginning of the paragraph, and </p> at the end.
2 .		The Scientific Inquiry “In Search of the Huntington Gene” describes the autosomal dominant disorder known as Huntington disease. This devastating disorder affects the nervous system of individuals, essentially causing it to deteriorate rapidly once the affected individual reaches a certain age. What are some of the symptoms of this disease? If an individual who carries a single copy of the Huntington allele mates with an individual who does not have the defective gene, what percentage of their offspring will be affected? Explain. Assuming that no parent would wish to pass a lethal gene on to their offspring, explain why diseases determined by autosomal dominant alleles, such as Huntington disease, continue to persist in the population.   To create paragraphs in your essay response, type <p> at the beginning of the paragraph, and </p> at the end.
3 .		Despite the development of a genetic test for Huntington disease, some individuals (such as Nancy Wexler in the Scientific Inquiry) have elected not to be tested. Explain why an individual would elect to not know their genotype for such a trait. If you knew there was a chance you carried the Huntington gene, would you elect to be tested? Why or why not?   To create paragraphs in your essay response, type <p> at the beginning of the paragraph, and </p> at the end.
4 .		The Case Study “Born to Drink,” presented in the chapter, describes the possible genetic basis of alcoholism. Despite demonstrating that a genetic component to alcoholism exists, it is important to note that behavior still plays a significant role in this disease. What are some of the benefits to identifying a group of genes linked to alcoholism in terms of developing treatments? In terms of prevention? Do you think these findings will make it easier to treat alcoholism, or more difficult? Explain your answer.   To create paragraphs in your essay response, type <p> at the beginning of the paragraph, and </p> at the end.