Microtubules.
a) They are a layered structure located between paired homologs in prophase I of meiosis in many organisms.
b) They are important for maintaining homologous chromosome pairing and plays a role in recombination.
c) They prevent sister chromatid separation until anaphase of mitosis or anaphase II or meiosis.
d) They are required for moving homologs to opposite sides of the poles during anaphase I of meiosis.
e) They are filaments in mitotic and meiotic spindles.
f) They are required for moving sister chromatids to opposite sides of the poles during anaphase II of meiosis and anaphase of mitosis.