Read the following statements regarding mitotic metaphase: (A) Complete disintegration of the nuclear envelope marks the start of this phase. (B) Each chromosome is made up of four sister chromatids. (C) Spindle fibres attach directly to the centromeres of the chromosomes. (D) Chromosomes are moved to the spindle equator and get aligned along the metaphase plate. How many of the above statements are correct?

Step-by-step solution

Statement (A) is correct as the complete disintegration of the nuclear envelope marks the onset of metaphase, allowing chromosomes to spread through the cytoplasm. Statement (B) is incorrect because a mitotic metaphase chromosome is made up of two sister chromatids, not four. Statement (C) is incorrect because spindle fibres attach to small disc-shaped structures called kinetochores present at the surface of the centromeres, not directly to the centromeres themselves. Statement (D) is correct as the alignment of ch