AP BIOLOGY

Detailed explanation-1: -Spindle fibers form a protein structure that divides the genetic material in a cell. The spindle is necessary to equally divide the chromosomes in a parental cell into two daughter cells during both types of nuclear division: mitosis and meiosis. During mitosis, the spindle fibers are called the mitotic spindle.

Detailed explanation-2: -The correct answer is (c); it is composed of microtubules, which help separate the chromosomes to opposite poles of the cell. See full answer below.

Detailed explanation-3: -Separation of the two spindle poles in prophase in an animal cell. In this model, plus-end-directed motor proteins operating on interacting antiparallel microtubules help separate the two poles of a forming mitotic spindle.

Detailed explanation-4: -Spindle fibres attach to kinetochore of chromosomes during metaphase.