new_n_lost
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Microscopic examination of a cancer cell reveals a cell in an abnormal telophase in which three clusters of chromosomes are seen.
An abnormality of which of the following would be most likely to produce this alteration?
A. Chiasma
B. Mitotic spindle
C. Mosaicism
D. Polar body
E. Synapsis
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| doc179
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B
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| SILVER
DoWhatYouGotToDo!
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B. Mitotic spindle
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| new_n_lost
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| new_n_lost
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The correct answer is B.
Abnormal mitotic spindles can produce tripolar mitoses. These are clearly abnormal mitoses that, when present, are considered definitive evidence that a tumor is malignant rather than benign. They are therefore often searched for by pathologists evaluating a tumor.
Chiasma (choice A) is the cross-like structure produced when a homologous pair of chromosomes aligns to exchange genetic material.
Mosaicism (choice C) refers to a difference in genetic material in different somatic cells of the same organism.
A polar body (choice D) is a daughter cell of a developing oocyte that contains almost no cytoplasm.
Synapsis (choice E) is a formal name for the pairing of homologous chromosomes with which meiosis begins.
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FORUM RULES-- Those who believe in telekinesis, raise my hand. I get enough exercise just by pushing my luck --P4U World.." The pure and simple truth is rarely pure and never simple."
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