In part species, cells go into a short interphase, or interkinesis, before entering meiosis II. Interkinesis lacks one S phase, therefore chromosomes room not duplicated. The two cells developed in meiosis ns go through the events of meiosis II in synchrony. During meiosis II, the sister chromatids within the two daughter cells separate, developing four brand-new haploid gametes. The mechanics of meiosis II is similar to mitosis, other than that each separating cell has only one set of homologous chromosomes. Therefore, each cell has fifty percent the variety of sister chromatids to different out as a diploid cell undergoing mitosis.
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If the chromosomes decondensed in telophase I, they condensation again. If atom envelopes were formed, they fragment into vesicles. The centrosomes that were replicated during interkinesis move away from each other toward the contrary poles, and new spindles room formed. The atom envelopes are totally broken down, and also the spindle is totally formed. Every sister chromatid creates an separation, personal, instance kinetochore the attaches come microtubules indigenous opposite poles.
The sisters chromatids space maximally condensed and also aligned in ~ the equator the the cell.
The sisters chromatids are pulled apart by the kinetochore microtubules and also move towards opposite poles. Non-kinetochore microtubules elongate the cell.
Figure 1. The procedure of chromosome alignment differs in between meiosis I and meiosis II. In prometaphase I, microtubules affix to the unify kinetochores that homologous chromosomes, and also the homologous chromosomes space arranged at the midpoint of the cabinet in metaphase I. In anaphase I, the homologous chromosomes space separated. In prometaphase II, microtubules attach to the kinetochores of sister chromatids, and also the sister chromatids are arranged in ~ the midpoint that the cell in metaphase II. In anaphase II, the sisters chromatids room separated.
Telophase II and Cytokinesis
The chromosomes arrive at the opposite poles and begin to decondense. Nuclear envelopes type around the chromosomes. Cytokinesis off the 2 cells right into four distinct haploid cells. In ~ this point, the newly developed nuclei are both haploid. The cells produced are genetically unique because of the arbitrarily assortment of paternal and also maternal homologs and also because the the recombining of maternal and paternal segment of chromosomes (with your sets of genes) the occurs during crossover. The entire procedure of meiosis is outlined in number 2.
Figure 2. An animal cell through a diploid variety of four (2n = 4) proceeds with the step of meiosis to kind four haploid daughter cells.
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Review the procedure of meiosis, observing how chromosomes align and also migrate, at Meiosis: An interactive Animation.