Microtubules grow out from the centrosomes, initiating formation of the mitotic spindle. During prometaphase, the nuclear envelope breaks into fragments. Some of the spindle fibers reach the chromosomes and attach to kinetochores, structures made of proteins, and specific sections of DNA at the centromeres.

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The mitotic spindle fibers attach to chromosomes via special structures termed; A) centrioles. B) asters. C) kinetochores. D) centrosomes. E) keratins.

4 天之前 · Telophase is characterized by the formation of two new daughter nuclei. The chromosomes reach the poles, and the spindle fibers disappear. As telophase progresses, the chromosomes, decondense to form chromatin, the nuclear membranes reform, and …

Anaphase: Spindle fibers shorten, the kinetochores separate, and the chromatids (daughter chromosomes) are pulled apart and begin moving to the cell poles. Telophase : The daughter chromosomes arrive at the poles and the spindle fibers that have pulled them apart disappear.

Metaphase I: SPINDLE FIBERS attach to each dyad at the KINETOCHORE. Tension from spindle fibers aligns the tetrads at the cell equator. Anaphase I: Chiasmata break apart and sister chromatids begin migrating toward opposite poles.

The accompanying animation depicts the movements of chromosomes in mitosis, the dissolution and reformation of nuclear membranes, the formation of the mitotic spindle, and the division of the cytoplasm (called cytokinesis) that results in two new daughter cells.

Spindle fibers are essential for cell division in eukaryotic cells. They consist of microtubules, centrosomes, and related structures that help organize and separate chromosomes. Their...

2024年4月8日 · Spindle Fibers, essential structures in cell division, are formed during both mitosis and meiosis. Their formation is intricately linked to the activity of microtubules, which are pivotal in establishing the framework that segregates chromosomes.