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Homologous chromosomes separate during ____.

seo-qna
Last updated date: 23rd Jul 2024
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Answer
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Hint: During anaphase I stage of meiosis, the cell begins to lengthen. In meiosis at this stage, the chromatids continue to be together as one complete, replicated chromosome. It can be marked through the separation of homologous chromosomes and their motion toward opposite poles. In telophase I, chromosomes move to opposite poles; in the course of cytokinesis, the cell separates into two haploid cells.

Complete explanation:
The prophase I of meiosis I is marked by using the synapsis of homologous chromosomes and crossing over. In metaphase I, the tetrads line up at the metaphase plate and homologous pairs orient themselves randomly and are marked through the movement of pairs of homologous chromosomes in the direction of the equator. In anaphase I, centromeres smash down and homologous chromosomes separate. In anaphase I, the microtubules pull the connected chromosomes apart. The sister chromatids (a dyad) remain very tightly bound together at the centromere which is a specialized DNA sequence of a chromosome. The chiasmata are damaged in anaphase I and at the same time the microtubules attached to the fused kinetochores pull the homologous chromosomes apart from it.
The condensation of chromatin and the appearance of chromosomes with sister chromatids take area in the course of prophase II. Metaphase II is marked by the association of chromosomes (each with two sister chromatids) on the cell's equator which is then separated by way of splitting of centromere and go towards opposite poles at some point of anaphase II.

Anaphase I is the correct option.

Note:
During anaphase I stage of meiosis, the cell starts to lengthen. The two homologs of every chromosome pair separate and move towards contrary poles, drawn by using the microtubules of the spindle apparatus. This contrasts with mitosis, where the sister chromatids of every homolog separate and move toward opposite poles.