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A red kerneled wheat plant is crosssed with a white-kerneled plant, yielding an F1 plant with all red kernels. A self-cross yields a 15:1 red:white ratio. A testcross yields a 3:1 red:white ratio. Explain the results. Draw Punnett squares for both the self- and test-cross.
Explain the action potential in terms of the different functional states of the voltage gated Na+ membrane channels.
A guinea pig farmer, who is also a geneticist, wishes to produce a suitable breeding population. He crossed strain of true breeding small guinea pigs and true breeding large ones.
A male rabbit with genotype GgBb. Find out the gametes produced by this rabbit (the sperm would have these combinations of alleles) Hint there are 4 combinations.
Suppose that the length of ten base pairs of DNA found in one turn of the helix is 34 A, what is the average length of a human chromosome in centimeters?
Describe the movement of water through the nephron including a description of the movement of salt and countercurrent multiplication.
What is the significance of the first and last codons of an mRNA transcript?
A rabbit taken from a meadow near sea level and moved to a meadow high on a mountainside would have some trouble breathing. Why give an appropriate reason.
Autoimmune haemolytic anaemia is caused in general by auto anti bodies of the IgG and IgM classes. Can antibodies of other classes such as IgA, IgD, IgE cause autoimmune haemolytic anaemia.
A 33 year old woman discovers a lump in her breast on her left breast on self examination. Her mother and sister both had breast cancer.
Explain two ways that mutations can affect the phenotypes that does not include alteration of the protein coding sequence.
A plasmid 3 Kb in length contains a gene for ampicillin resistance and a gene for tetracycline resistance. The plasmid has a single site for each of EcoRI, Bg/II, and PstI.
What is the difference between stimulation of the right vagus versus the left vagus? How are they connected to the heart? What would you expect to see upon left vagus stimulation?
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