MCAT Question A Day - 5/19/14 - Answer!
A scientist monitors the nucleotide sequence of the third chromosome as a cell undergoes normal meiosis. What is the earliest point in meiosis at which the scientist can deduce with certainty the nucleotide sequence of the third chromosome of each gamete?
A. prophase I
B. metaphase I
C. prophase II
D. telophase II
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A is correct. In normal meiosis, the only change in the nucleotide sequence of the third chromosome will occur during crossing over. Crossing over occurs in prophase I.
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