Question

Choose odd one out
centrosome , centromere , cetroile , spindle
Give reason also

Answer 1

1-Aster formation because of mitosis 2-splitting of centromere because of mitosis

Answer 2

These cylinders are individually called centrioles, and initially they are connected by a short linker (dotted line) in early G1.

Each of these centrioles can undergo duplication, that is, a new daughter centriole can form at the base of the older (mother centriole) in late G1/early S-phase, and the daughter centrioles go on to elongate by G2.

Now see that yellow cloud-like stuff behind the centrioles in each picture. This cloud is called the pericentriolar matrix, or PCM. This PCM starts to expand in G2 because it is essential for nucleation and growth of the spindle fibres, or microtubules.

A single centrosome consists of either one or two centrioles AND the PCM (represented by the dotted circle in the right-most figure). Each mitotic cell has two centrosomes and four centrioles (two per centrosome). Each cell in G1 however, has two centrosomes but only two centrioles (one per centrosome).