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gene A controls the sharpness of spines in a type of cactus. cactuses with the dominant allele, A, have sharp spines, whereas homozygous recessive aa cactuses have dull spines. at the same time, a second gene, N, determines whether cactuses have spines at all. Homozygous recessive nn cactuses have no spines at all.A) the relationship between genes A and N is an example of?B) a cactus with sharp spines is crossed with a spineless cactus. all of the offspring have spines but approximately half of the 100offspring have dull spines and half have sharp spines. what are the genotypes of the parent cacti?
How have population and evolutionary genetics theory been used to detect signatures of recent natural selection in sequenced genomes, such as in human genomes.
Explain why does vaccination provide long-term protection against a particular disease but passive immunization provides only temporary protection?
During sleep, relay neurons in the thalamus reduce information reaching the cerebrum by altering their membrane potential. In diagnosing bacterial and viral infections of the nervous system, samples of CSF are extracted from the spinal cord.
You have synthesized a compound that binds to the active site of a critical bacterial enzyme. You want to know if the inhibitor is a reversible or irreversible inhibitor. Describe an experiment that would provide this answer, note the possible out..
If the forward mutation rate is 1 x 10-5 new mutations per gene per generation, what is the average number of new mutations per gamete per generation? Show your work.
How does an active infection occur in the urinary tract? Which factors in the urinary tract predispose humans toward urinary tract infections?
As Jung-Min Kee and Tom W. Muir noted in their recent review article, 2012 marked the fifty anniversary of discovery of histidine phosphorylation in proteins.
define how the rate of many enzyme catalyzed reactions varies with pH. What types of amino acids must be at the active site of an enzyme if its rate decreases at high pH.
A fluid containing cells is used for chemical identification. The fluid runs through a rectangular channel that is twenty micrometers wide 10 micrometers deep 10 millimeters long.
one of the problems associated with growing plants in space is lack of gravity.
Explain why random union of male and female gametes is necessary for Medelian segregation and independent assortment to occur.
Define membrane potential (Vm) and sodium equilibrium potential (ENa). Which of these, if any, changes during the course of an action potential?
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