NEETBotanyCell Cycle and Cell Division
A cell is observed under a microscope during division. The chromosomes are found to be aligned at the equator of the cell. It is specifically noted that spindle fibres from one pole are attached to the kinetochore of one entire chromosome (consisting of two sister chromatids), while spindle fibres from the opposite pole are attached to the kinetochore of its homologous partner. Identify the specific stage of cell div
Options
- AMetaphase I of meiosis
- BMetaphase of mitosis
- CMetaphase II of meiosis
- DAnaphase I of meiosis
Correct answer
A. Metaphase I of meiosis
Step-by-step solution
In Metaphase I of meiosis, the bivalent chromosomes align on the equatorial plate. The microtubules from opposite poles of the spindle attach to the kinetochores of homologous chromosomes. This means each entire chromosome (with its two sister chromatids) is attached to only one pole. In contrast, during mitotic metaphase and metaphase II of meiosis, spindle fibres from opposite poles attach to the kinetochores of sister chromatids of the same chromosome. Anaphase I involves the actual movement of these homologous