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

During karyokinesis in meiosis I, homologous chromosomes segregate. This is a crucial phase ensuring each resultant cell acquires one chromosome from each homologous pair.

Meiosis I karyokinesis stages:

• Prophase I: Chromosomes condense, and homologous chromosomes form bivalents via synapsis. Genetic material is exchanged between homologs through crossing-over.
• Metaphase I: Homologous chromosome pairs align at the cell's metaphase plate.
• Anaphase I: Spindle fibers pull homologous chromosomes to opposite poles. This is the separation event.
• Telophase I: Chromosomes arrive at the poles, and the cell divides into two.

Therefore, meiosis I involves the separation of homologous chromosomes, distinct from sister chromatid separation in meiosis II.