Autosomal dominant diseases are exhibited by anyone who carries at least one dominant allele for that gene. How is it that dominant lethal genes, such as the one that causes Huntington disease, can persist in a population?
a. The disease-causing allele can "hide" in the heterozygous condition.
b. The disease develops only under the influence of other genes.
c. These diseases usually take effect later in life after people have had children.
d. The environment plays a large role in determining whether the gene is expressed.
c. These diseases usually take effect later in life after people have had children.
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Some viruses cause abnormal growth of cells rather than destruction. This is called ________.
Fill in the blank(s) with the appropriate word(s).
The individuals responsible for constructing the first model of DNA structure were
(a) Wallace and Watson. (b) Lamarck and Darwin. (c) Mendel and Meischer. (d) Crick and Watson.
Acidimethylosilex fumarolicum can grow using ________ as a carbon source and energy source.
Fill in the blank(s) with the appropriate word(s).
Select the best choice below to match statements 135–137
a. surgical correction b. chemotherapy c. genetic screening d. genetic counseling e. gene therapy M 135. Identification of persons with sickle-cell anemia can be done by this method. M 136. Once the risks have been determined, this method is an effective way of dealing with a genetic disorder prior to its occurrence in a child. M 137. The substitution of a normal allele for a defective allele via the methods of genetic engineering would be an example of this.