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Identify the meiotic stage in which the homologous chromosomes separate while the sister chromatids remain associated at their centromeres:
Option: 1
Metaphase I
Option: 2
Metaphase II
Option: 3
Anaphase I
Option: 4
Anaphase II
Answers (1)
Stages of Meiosis ? - Metaphase I and Anaphase I
Metaphase I
- During this phase, bivalents arrange themselves on the metaphase plate.
- Hence, a fully formed spindle and equatorial alignment of the chromosomes are seen during this phase.
- The alignment of homologous chromosomes is independent of each other.
- This is responsible for generating genetic variability.
Anaphase I
- The homologous chromosomes of each bivalent separate from each other.
- The separated homologous chromosomes move to opposite poles
- Therefore, in this phase, the chromosomes separate and not the chromatids.
- So, each chromosome will still have two sister chromatids.
- Hence, anaphase I involve a reduction in the number of chromosomes.
Homologous Chromosomes separating from each other during Anaphase I
-
During anaphase I, the homologous chromosomes separate from each other such that each homologous chromosome moves to the opposite poles. The chromatids of the homologous chromosomes still remain intact.
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