Question

The condensation of chromosome takes place during
A. Interphase
B. Prophase
C. Metaphase
D. Anaphase
E. Telophase

Answer 1

Hint: The appearance of condensing chromosomes can be seen in the first phase of mitosis. Mitosis has four major phases- prophase, metaphase, anaphase, and telophase.

Step by step answer:
In the interphase stage chromosomes are diffused, long coiled, and not clearly visible chromatin fibre. Prophase is the first stage of the mitotic stage. In this phase, condensing of chromosomes are seen and the chromosome is made up of coiled filaments, the chromatids. The word prophase means pro = before; phasis = appearance. Metaphase is the second stage of mitotic division where the chromosomes are short and thick. Anaphase is the third stage of mitotic division. In this stage, splitting each chromosome into daughter chromosomes is the beginning of the phase. In the further stage of anaphase, the poleward movement of chromatids due to the shortening of kinetochore microtubules takes place. Telophase is the fourth stage of mitotic division. In this phase, it starts with the end of polar migration of the daughter chromosomes; which in turn is terminated by the reorganization of two nuclei and it enters into the G1 phase of interphase.

So, the answer is B, i.e., Prophase

Note: M phase is called a mitotic phase. The G1 phase also known as the resting phase or first growth phase or first gap phase, S phase also known as the synthetic phase, and the G2 phase also known as the resting phase or Second gap phase or growth phase together makes the Interphase of the cell cycle. The cells which no longer divide get arrested in the G1 phase which is known as the G0 phase.