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Question:

Which of the following is not a characteristic of meiosis?

Sister chromatids separate during anaphase II.

It involves two stages of DNA replication one before meiosis I and another before meiosis II.

It involves recombination and crossing over.

Nuclear membrane disappears during prophase.

Solution:

DNA replication occurs once but meiosis has two M-phases each with its own karyokinesis and cytokinesis. As a result chromosome number is halved. The transition period between M-phase I (meiosis I) and M-phase II (meiosis II) is short and without DNA replication. It is called interkinesis. So, the correct answer is option B.