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In maize the genes Pl for purple leaves (dominant over green leaves); sm for salmon silk ( recessive for yellow silk) and py for pigmy plant (recessive to normal size) are on chromosome 6 at positions 45, 55 and 65 respectively. Predict the proportion of gamete types from the testcross assuming no interference.
Selective pressure is often thought to occur within the coding region of a gene but when the sum of Ka/Ks for each position is calculated, no positive selection is shown. Why is this? Can you think of a way to show positive selection in such a gen..
Mice are diploid with 2n=40. Determine how many chromosomes make up the genome and how many chromosomes would you expect to see in a mouse gamete.
Throughout much of Europe, there has been a severe decline in mushroom population. On study plots in Holland, data collected since 1912 indicate that the number of mushroom species has dropped from 37 to twelve per plot in recent years.
Will net flow of K+ move out of the cell indefinitely? No, when enough K+ has flowed out of the cell, the interior of the cell will become negatively charged, which will result in the K+ being drawn back in.
Think about a man who has been exercising. His arterial receptors detect a rise in his blood CO2 and send this information to the brain. He requires to increase both the rate and depth of his breathing.
Action potentials are usually generated at axon hillock and propagated down axon away from the cell body. If you experimentally depolarized an axon to the threshold level at a point halfway down the axon, what would happen.
For each of the following mutagens, indicate what type of mutation will be induced. Also, explain how the mutagen induces the damage.
huntingtons disease is an autosomal dominant disorder. This means that if an individual has atleast one copy of the gene for the disease, they will exhibit the phenotype. If the frequency of the dominant allele is 0.08.
Intravenous injections are commonly performed with a hypodermic needle and syringe. Suppose that the dimensions of the needle are length = L,
Describe the process of muscle contraction and how a neuromuscular blocking agent, such as metubine, would interfere with muscle contraction.
Describe why biological information of amino acid sequences in proteins is encoded in codons composed of 3 nucleotides and NOT 2 nucleotides.
What information does it not provide that may be useful for deciding on conservation efforts. What are the genotypes of the parents.
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