Question

In karyokinesis of meiosis - I, which of the following separates?

• A. Sister chromatids
• B. Homologous chromosomes
• C. Sister chromatids and homologous chromosomes
• D. Spindle poles

Hint:

In meiosis I, the focus is on the separation of homologous chromosomes, whereas in meiosis II, sister chromatids are separated.

Answer 1

The Correct Option is B

In meiosis I, specifically during karyokinesis (the division of the nucleus), the homologous chromosomes separate. This is a critical step in meiosis, as it ensures that each daughter cell receives one chromosome from each pair of homologous chromosomes.

Steps involved in karyokinesis of meiosis I:

• Prophase I: Chromosomes condense and homologous chromosomes pair up through a process known as synapsis. Crossing-over occurs, exchanging genetic material between homologous chromosomes.
• Metaphase I: Homologous chromosome pairs align at the equatorial plate of the cell.
• Anaphase I: The homologous chromosomes are pulled apart by the spindle fibers toward opposite poles of the cell. This is where the separation occurs.
• Telophase I: The separated chromosomes reach the poles, and the cell divides into two daughter cells.

Thus, during meiosis I, it is the homologous chromosomes that separate, not the sister chromatids, which occur in meiosis II.