AP BIOLOGY

Detailed explanation-1: -Centrosomes are organelles that serve as the main microtubule-organizing centers for animal cells. Centrosomes are made up of two, barrel-shaped clusters of microtubules called “centrioles” and a complex of proteins that help additional microtubules to form.

Detailed explanation-2: -The structure involved in the formation of spindle fibres are centrioles. They exist in a pair close to the nucleus and are present only in the animal cell.

Detailed explanation-3: -And those centrioles are very important for cell division. So when the cell is going to divide, those centrioles go to opposite ends of the nucleus. And when the chromosomes are condensing to undergo mitosis, the centrioles form the areas that mitotic spindle forms from.

Detailed explanation-4: -When animal cells undergo mitosis they are considered by some to benefit from the presence of centrioles which appear to control spindle fibre formation and which later has an effect on chromosome separation.

Detailed explanation-5: -Centrioles are primarily involved in forming two structures-centrosomes and cilia. Centrioles bias the position of spindle pole formation, but because spindle poles can self-organize, the function of the centriole in mitosis is not obligatory.