Question

The separation of two chromatids of each chromosome at early anaphase is initiated by

• A. the interaction of centromere with the chromosomal fibres
• B. the elongation of metaphasic spindle
• C. the force of repulsion between the divided kinetochores
• D. all of these

Answer 1

Answer: (C)

the force of repulsion between the divided kinetochores

Answer 2

Kinetochore is a plate-like structure by which microtubules of the spindle attach to the centromere of a chromosome during nuclear division. The centromere of each chromosome divides into two, so that each chromatid comes to have its own centromere. The two chromatids now start repelling each other and separate completely to become daughter chromosomes. The daughter or new chromosomes move towards the poles of spindle along the path of their chromosome fibres.