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question 18
at the start of mitotic anaphase,

1. the centromeres of each chromosome come apart
2. dna replicates.
3. nuclear envelopes begin to form around the chromosomes.
4. chromosomes condense from chromatin.

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Explanation:

• Option 1: In mitotic anaphase, the centromeres of each chromosome split apart. This allows sister chromatids (which were held together at the centromere) to be pulled to opposite poles of the cell by spindle fibers.
• Option 2: DNA replication occurs during the S - phase of the cell cycle, long before mitosis (including anaphase) begins.
• Option 3: Nuclear envelopes begin to form around the chromosomes during telophase, the last stage of mitosis, not anaphase.
• Option 4: Chromosomes condense from chromatin during prophase, the first stage of mitosis.

Answer:

1. the centromeres of each chromosome come apart