For the following question(s), match the key event of meiosis with the stages listed below.
I. prophase I V. prophase II
II. metaphase I VI. metaphase II
III. anaphase I VII. anaphase II
IV. telophase I VIII. telophase II
-Which of the following statements best describes how often crossing over occurs in humans?

Question

Quizplus · Accepted Answer

Crossing over occurs during prophase I of meiosis and it is known to happen at least once per chromosome pair in humans. This leads to genetic recombination and increases genetic diversity. Option A is incorrect because ~50 times per chromosome pair would imply an extremely high frequency of crossing over events that is not supported by current research. Option B is also incorrect because crossing over occurs multiple times per cell, not just twice. Option D is incorrect because sister chromatids are identical and do not exchange genetic material during crossing over.

For the Following Question(s), Match the Key Event of Meiosis