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Cystic fibrosis (CF) is caused by a genetic mutation resulting in defective proteins in secretory cells, mainly in the epithelial lining of the respiratory tract. The one in every 2,000 Caucasian babies who has the disease is homozygous for the recessive mutant. Although medical treatment is becoming more effective, in the past most children with CF died before their teens. About 20 Caucasians in 2,000 are carries of the trait, having one mutant and one normal allele, but they do not develop this disease. According to the rules of population genetics, the frequency of the homozygous recessive genotype should be rarer than it is. What is one possible explanation for the unusually high frequency of this allele in Caucasian populations?
How many ATP is formed through glycolysis and where does the ATP come from?
What was the dilution of the MIC for the mouthwash and the bleach? Hint: You will have to calculate the dilution of each tube 2 - 4.
A friend has just returned from a trans-Atlantic jet aircraft flight and reported that the plane dropped about1000 m when it entered an "air pocket." Explain to a friend what apparently happened to cause this drop.
Can enhancers work in trans? That is, can an enhancer on one piece of DNA activate a promoter on another piece of DNA. Propose an experiment to test this. Be sure to discuss any appropriate control experiments.
Please complete the chart below and identify the nutritional needs of both males and females throughout the stages of life.
2-types of signals have been implicated in metaphase checkpoint arrest. Think about the results of a recent experiment in which the unattached kinetochore of a monoattached chromosome was destroyed by a laser beam.
Reactant X participates in the reaction X ? Y + Z. Two experiments were performed to determine the rate of the reaction with 0.200 M and 0.400 M of reactant X.
discus the histopathology of skin in relation to skin diseases such as malignant melanoma pernicious carcinoma basal
find out in which step each auxotroph has a mutaion. ("+" represents growth of the auxotroph on minimal meduim supplemented with the compund. ("-" represents no growth of the auxotroph on minimal meduim supplemented with the compound)
Give the DNA sequence for the template strand that gives rise to the following sequence gel, prepared using the sanger method with a radioactive label at the 5' end of the primer.
when mendel crossed yellow-seeded and green seeded pea plants, all the offspring were yellow seeded. when he took these F1 yellow-seeded plants and crossed them to green-seeded plants, what genotypic ratio is expected?
How many nucleotides are necessary to encode for this single chain?
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