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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?
What genotypic and phenotypic proportions are expected in F2. Six platyfish with dissimilar tail spotting patterns live in eastern Mexico. Five of them can interbreed and produce fertile offspring. One of them cannot interbreed with the other five. W..
What is the most likely defect associated with the Ser63 deletion mutant. How would you design an experiment to test your hypothesis using culture cells and the expression construct of wild-type and Ser63 deletion mutant of P0.
He says that the mere presence of DNA is not sufficient to prove the point: his cells may have adopted DNA as a useful molecule quite independently of all other known life forms. What would you do to convince him that he was wrong.
Diploid nuclei of the ascomycete, Neurospora crassa, contain 14 chromosomes. A single diploid cell in an ascus will undergo one round of meiosis, followed in each of daughter cells by one round of mitosis, producing a total of eight ascospores.
What is the probability that they will have a male child who is a hemophiliac. what is the possibility that he will be colour blind.
Who was Carl Weigert? What influence did Weigert have on Ehrlich. Other than the acid-fast stain, what other technique may be used to diagnose tuberculosis? What scientist developed this test.
Describe how EDTA promotes the dissociation of animal cell tissue. How various genotypic and phenotypic combinations are possible in the offspring of a brown-eyed, red-haired, taster man with AB blood group (Bb rr Tt AB) married to the blue-eyed, non..
What is the most common agent of UTIs . The pool regularly becomes infested with disease-causing viruses and bacteria. Which species are more possible to thrive in the changing environment.
What phenotypes will you suppose among the 1024 offspring, and how many of each phenotype would you expect.Suppose that a cross is made between a fly with normal wings.
If amino acid sequences might be useful in determining how closely related dissimilar species are but may not be very useful for identifying a particular species, suggest two reasons why.
In this case, we are tracking an enzyme secreted by pancreatic cells. What is its most possible pathway. Find out how many calories you will have saved by eating this reduced-fat product instead of the high-fat one.
A person has MG what would be the expected effect on calcium levels near contractile proteins, following the arrival of an electrical impulse at those neuromuscular junctions.
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