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During prophase, chromosomes become visible
publish date: 2026/06/16 11:03:14.955730 UTC
As chromosomes condense during prophase, they take on a characteristic shape. Each condensed chromosome consists of two identical copies held together.
Each arm of the X-shaped chromosome is called a (1), and the two are held together at a single point called the (2).
Please drag and drop the selected option in the right place or type it instead
nucleolus
spindle
centromere
chromatid
Correct Answer
(1) chromatid
(2) centromere
Explanation
Once chromosomes recoil and condense during prophase, they become X-shaped. Each X is composed of two identical chromatids - one was copied from the other during DNA replication in interphase. The two chromatids are held together at a single point called the centromere. At metaphase the centromeres divide, allowing the chromatids to be pulled to opposite poles during anaphase.
Reference
Biology: A Self-Teaching Guide