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Q1. The sex linked (X linked) Xg locus in humans has two alleles, a+ abd a. The a+ allele causes the presence of Xg surface protein antigen on red blood cells, while the recessive a allele does not. The Xg locus maps 10 centimorgans from the STS locus. The recessive sts allele results in the lack of steroid sulfatase activity and homozygous females, as well as sts/Y males, develop ichthyosis, a form of scaly skin. A man with ichthyosis and no Xg antigens has a normal daughter with Xg antigens who is expecting a child.
a. If the child is a boy, what is the probability that he would lack the Xg antigen and have ichthyosis?
b. What is the possibility that the son would have both the Xg antigen and ichthyosis?
Q2. A man enters hospital complaining of chest pain. His history includes smoking, a stressful job, a diet heavy in saturated fats, lack of exercise, and high blood pressure. Although he is not suffering from a heart attack, his doctor explains to him that a heart attack is quite possible. What did the chest pain indicate? Why is the man a major candidate for a heart attack?
NMR spectroscopists often do experiments in D2O. The deuterium atoms in D2O can exchange for hydrogens in an organic molecule if and only if those hydrogens are exposed to solvent and are attached to polar atoms.
The plasma membrane acts as a barrier in cells of all types to control the movement of substances into and out of the cell. a) Explain how the plasma membrane acts as a semi-permeable barrier to various types of molecules based on its molecular st..
Discuss what other sources of information say about the same concepts presented in the article. Are there discrepancies between the information in the article and that from other sources?
In a cross drosphila involving the x-linked recessive eye mutation white (w) and the autosomally-linked recessive wing mutation curved (c) predict f1 phenotypic results of a cross of true-breeding flies with the phenotypes.
Dozens of potato varieties exist, differing from each other in potato-tuber size, skin colour, flesh colour, and shape. One might construct a classification of potatoes based on these morphological traits. Which of these criticisms of such a classifi..
Determine which of the following best explains why cardiac muscle is incapable of tetanus, a sustained contraction characteristic of skeletal muscle?
What determines the arrangement of spores in a second division segregant? Explain the difference between the following patterns.
When the sperm cell unites with egg cell this is known as ______. Usually, this happens in the ______. After four or five days, the developing zygote arrives the uterus.
A 3-year-old child is admitted with primary nephrotic syndrome. What signs and symptoms would be identified? What are the mechanisms behind these manifestations? What is the primary treatment for this syndrome and why?
A test tube contains starch, pancreatic amylase, and water. The buriet is negative. After 30 minutes, Benedict's test is positive. What substance is present.
73.7 mL of stock ethanol was added to 26.3 mL of distilled H20 to generate a 70% ethanol solution. What was the concentration of the initial stock ethanol?
Calculate the amount of ATP equivalents produced by total catabolism of adenosine compare this with ATP equivalents produced by total catabolism glycine.
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