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Question: XPA is a recessive DNA repair disorder that causes skin cancer with even the smallest exposure to sunlight. Heterozygotes (Xx) are carriers, but are not affected. In the U.S., 1/250,000 people have the disease. In Japan, 1 in 22,000 has the disease. What is the frequency of the mutated XPA allele (x) in each population?Question: Phenylthiocarbamide (PTC) tastes bitter to most people. The inability to taste PTC is controlled by a single recessive allele. In the Australian Aboriginal population, 58% can taste PTC, and 42% cannot. Estimate the allele and genotype frequencies of the taster (T) and non-taster (t) allele in this population.
Question: Sickle-cell anemia is caused by receiving two copies of a recessive allele on Chromosome 18Q. The recessive allele has a deletion mutation that causes problems with the hemoglobin complex, and red blood cells curl into a sickle shape as a result. One in 500 African Americans has sickle cell anemia. One in 36,000 Hispanic Americans has the disease.What is the frequency of the sickle cell allele in these two populations?What percentage of these two populations will be carriers of the trait, but not have the disease?
Birth control pills maintain a high blood level of estrogen and progesterone. Determine what is happening in the ovary when the blood level of estrogen is high?
Some sensory neurons in our bodies generate action potentials in response to pressure or movement, allowing us to feel things through our sense of touch.
Propose a hypothesis to explain the current decline in Songbird numbers. Design an experiment that could test your hypothesis.
List the two kinds of macromolecules that have been partially digested by the time acid chim moves into the intestine. Where did this digestion take place, and what enzymes are involved.
Chose to do an informational interview, start thinking of your topic and interview questions now. See the course project description for more information on this project component.
Utilize your imagination to describe two ways in which disturbance of the sort just described may affect the animals that live on the panels and amount of free space available.
Explain the phenotypes obtained in the F2 generation. Analyze the phenotypes and sexes of each fly. Is there a sex and phenotype combination that is absent or underrepresented?
Suppose archaeologists discover human skeletal remains in Ethiopia. Examination of the bones suggests that the remains represent four types of individuals. Two of the skeletons have bone densities that are 30 percent less than those of the other two ..
as calcium and magnesium salts of fatty acids are insoluble in water, how would you expect this to affect the usefulness of soap in hard water.Why would these results happen the way they did.
You are the lead engineering in charge of running a single chemostat reactor (75 L) to produce a therapeutic protein from an engineered organism.
What disorder does this man have? Gastric secretions normally include about 10mmole/L potassium. How do you account for the low serum potassium in this patient.
Irregularly a person is discovered to have one blue eye and one brown eye. This is caused by the creation of a new mutation. In which cell did the mutation occur?
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