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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?
Ralph is taking scuba diving classes, and is warned not to hold his breath as ascending from depth but to continuously release air from his mouth. What is the basis of this instruction and what is risk if it is ignored.
Albinism is a condition that results from the lack of normal pigmentation. In humans, individuals with two recessive alleles at ALBINO (aa) locus are albino.
Drag the labels onto the graph to indicate which presynaptic neuron produced each change in the axon hillock's membrane potential. Assume that the same number of ligand-gated ion channels opens at each synapse.
Which of the follow is NOT a function of meiosis. Generation of genetic diversity by crossing over.
Approximation the age group and gender (where possible) of the individuals in this find. Throughout exposure to elevated glucose, a yeast cell's membrane glucose transporters will rapidly enhance so the cell can import glucose. Which will represent t..
The Verhulst's logistic model has been practical to the natural growth of the halibut population in certain areas of the Pacific Ocean. Let NN, measured in kg, be the total mass (or biomass) of the halibut population at time tt.
What part of the sewage treatment plant deals with insoluble and complex organic wastes? Which molecule contains more energy, X or Y.
The phenotypic variances were 9.4 cm2 for the inbred strain and 26.4 cm2 for the randomly pollinated population. Guess the broad sense heritability of ear length in these populations. What are the usual frequencies of the gametes from a plant with th..
In an experiment you are studying a neuron that receives synaptic inputs from two other neurons: one from neuron A and one from neuron B. Illustrate a separate graph for each value of Vm.
If the centrioles are mispositioned in the cell, the functional mitotic spindle would fail to form. In this state, how will chromosome segregation be affected . Microtubules will not attach to kinetochores.
Recently, use of cleaner fuels has greatly reduced soot in the landscape, and dark-coloured moths have been disappearing. Should the two forms of moths be considered separate species.
Explain three things that a paleontologist must do to plan a fossil hunting expedition so that he is likely to find evidence to reply a specific scientific question.
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