What are centrioles, spindle fibers, centromeres?
Centrioles-A self-replicating, small, fibrous, cylindrical-shaped organelle, typically located in the cytoplasm near the nucleus in cells of most animals. It is involved in the process of nuclear division.
spindle fibers-Any of a network of filaments that collectively form a mitotic spindle (in mitosis) and meiotic spindle (in meiosis). It is chiefly involved in moving and segregating the chromosomes during nuclear division.
centromeres-he constricted region joining the two sister chromatids that make up an X-shaped chromosome.