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Spindle fibers attach to kinetochores of chromosomes during
Metaphase is defined by two key events: 1) Spindle fibres attach to kinetochores; 2) Chromosomes align along the equatorial metaphase plate!
The complete disintegration of the nuclear envelope marks the start of the second phase of mitosis, metaphase. Hence the chromosomes are spread through the cytoplasm of the cell.
Small disc-shaped structures at the surface of the centromeres are called kinetochores. These structures serve as the sites of attachment of spindle fibres formed by spindle microtubules.
NCERT explicitly states that metaphase is characterized by spindle fibres attaching to kinetochores of chromosomes and chromosomes moving to the spindle equator.
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In anaphase, sister chromatids separate and are pulled toward opposite poles.
In telophase, chromosomes reach respective poles, decondense, and nuclear envelopes reform.
In prophase, chromatin condenses and the mitotic spindle begins assembly, but kinetochore attachment occurs upon nuclear envelope breakdown at metaphase.
Metaphase is characterized by attachment of spindle fibres to kinetochores of chromosomes.
Confusing the initiation of spindle assembly (prophase) with actual kinetochore capture/attachment (metaphase).
"Small disc-shaped structures at the surface of the centromeres are called kinetochores. These structures serve as the sites of attachment of spindle fibres... Hence, the metaphase is characterised by all the chromosomes coming to lie at the equator."
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