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Cytokinesis-the actual process of cell division-has attracted theorists for well over 100 years. It has been said that all possible explanations of cytokinesis have been proposed; the problem is to decide which one is correct.Consider the following three hypotheses:1. Chromosome signaling: When chromosomes split at anaphase, they emit a signal to the nearby cell surface to initiatefurrowing.2. Polar relaxation: Asters relax the tension in the region of the cell surface nearest the spindle poles (the polar region),allowing the region of the membrane farthest from the poles (the equatorial plane) to contract and initiate furrowing.3. Aster stimulation: The asters stimulate contraction in the region of the cell surface where oppositely oriented spindle fibersoverlap (that is, the equatorial region), thereby initiating furrowing.These hypotheses have been tested in a number of ways, One particularly informative experiment involved pressing a glass ballonto the center of a dividing sand dollar egg so as to deform it into a torus (donut shape). As illustrated in Figure 17-35, the eggdivided into a single sausage-shaped cell at the first division; at the second division, it divided into four cells.A. What does the chromosome-signaling hypothesis predict for the result of this experiment? Do the predictions match the experimental observations?B. What does the polar-relaxation hypothesis predict for the experimental out-come? Do the predictions match the experimental observations?
C. What does the aster-stimulation hypothesis predict? Do the predictions match the experimental observations?
Person and the situation interact to shape a person's goals, thoughts, feelings, and behaviors - Different persons respond differently to the same situation and situations choose the person.
Waxy endosperm, shrunken endosperm, and yellow seedling are encoded by three recessive genes in corn that are linked on chromosome 5. Find the the genetic distance between Wx and V
Zebrafish are increased in fish tanks with one family each tank. The mutation spadetail is a recessive lethal. A stock tank for spadetail was made by crossing two carriers.
What would DNA footprinting reveal about the DNA binding sites of a normal Lac repressor protein? A normal RNA polymerase.
Suppose that the field of view is at 400x total magnification is 0.26mm. Determine the height of onion cells pictured below from and image observed at 400x.
Research protist parasites in the Genus Giardia. Scientists have proposed that these organisms represent the "missing link" between prokaryotes and eukaryotes. Explain the cellular structure of Giardia and describe how the cells are alike to typical ..
Define synergy in Interleukins and discuss the importance of this fact to its use in stem cell research.
Describe a series of small habitats that exist within 10 or 20 kilometers of your house and which might be subject to MacArthur and Wilson's theory of island biogeography.
Describe how environmental change and natural selection combine to shape a population's range of traits and explain how these patterns influence the direction of evolution.
explain how stem cells obtained from fertilization in the fallopian tube and somatic cell nuclear transfer differ in terms of the source of their genome, age of blastocyst.
What effects would this have on the H, A, and I bands?
Considering the circumstances and the preliminary work-up, what type of anemia is most likely for Ann? Which clinical sign shows her body is attempting to compensate for anemia?
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