Question

Separation of chromosome with associated chromatid at centromere occurs in?

• A. Anaphase
• B. Anaphase I
• C. Anaphase II
• D. Anaphase and Anaphase I

Answer 1

The correct option is B Anaphase I

i) During anaphase 1, homologous chromosomes are pulled towards the opposite poles by the shortening of kinetochore microtubules.

ii) The non-kinetochore microtubules are lengthened in order to push the chromosomes further apart.

iii) Homologous chromosomes are separated from the cohesin at the arms of the chromosomes.

iv) Each separated bivalent chromosome starts moving towards the opposite poles due to the tension generated by the microtubules.

v) Anaphase 1 is followed by telophase 1 where the bivalent chromosomes arrive at the opposite poles.

Therefore the correct answer is option B. Anaphase 1.