In anaphase, I, centromeres of homologous chromosomes are attached to the spindle fibres so as the two spindle fibres are attached to the centromeres of each homologous chromosome. On the other hand, in anaphase II, both spindle fibres are attached to the same chromosome. Besides, during the anaphase, I, centromeres of the chromosomes do not split while during the anaphase II, centromeres split and sister chromatids separate in each chromosome.
Hence, it is also a difference between anaphase I and anaphase II. The below infographic presents more details on the difference between anaphase I and anaphase II.
Meiosis is one of the two cell divisions. It produces four daughter cells from one parent cell. Each cell contains half of the chromosomes of the parent cell. Meiosis occurs via two main processes; meiosis I and meiosis II. Each meiosis has four subdivisions.
The key difference between anaphase I and anaphase II is that during the anaphase I, the homologues chromosomes are pulled apart and move apart to opposite ends of the cell while during the anaphase II, sister chromatids of each chromosome are separated and are pulled towards the poles. Furthermore, anaphase I occur when the cell is in the diploid state while the anaphase II occurs when the cell is in the haploid state.
Thus, this summarizes the difference between anaphase I and anaphase II. Available here 2. Available here. Samanthi Udayangani holds a B. Degree in Plant Science, M.
Your email address will not be published. The non-kinetochore microtubules are lengthened in order to push the chromosomes further apart. Homologous chromosomes are separated from the cohesin at the arms of the chromosomes. Each separated bivalent chromosome starts moving towards the opposite poles due to the tension generated by the microtubules.
Anaphase 1 is followed by telophase 1 where the bivalent chromosomes arrive at the opposite poles. The first division of the cytoplasm is initiated at the anaphase 1. Figure 1: Phases of Mitosis. Anaphase 2, which takes place at the meiosis 2, is the step where sister chromatids are separated. Metaphase 2 is followed by anaphase 2. During metaphase 2, two kinetochore microtubules, each from two opposite poles, are attached to the same centromere of the individual chromosomes.
The proper arrangement of the individual chromosomes at the equatorial plate, binding with the kinetochore microtubules lets the cell to proceeds into the anaphase 2. During anaphase 2, the centromeric cohesion protein complexes are cleaved due to the contacting tension of the kinetochore microtubules on the centromere of the each individual chromosome. Thus, the bivalent chromosomes are separated into two sister chromatids. Each sister chromatid is now known as a daughter chromosome.
Further contraction of the kinetochore microtubules pulls each daughter chromosome towards the opposite poles. Anaphase 2 is followed by the telophase 2 where the formation of the haploid nuclei at the opposite poles is taken place.
Anaphase 1: Anaphase 1 takes place during meiosis 1. Anaphase 2: Anaphase 2 takes place during meiosis 2. Anaphase 1: Anaphase 1 occurs in diploid cells. Anaphase 2: Anaphase 2 occurs in haploid cells. Anaphase 1: Two spindle fibers are attached to the centromere of the each chromosome in the homologous pair. This step resembles with the anaphase of mitosis because the number of chromosomes remains the same after the division. Both anaphase I and anaphase II are the phases of meiosis which is the part and parcel of sexual reproduction in human beings and other animals.
It is very important for biology students to know the differences between anaphase I and anaphase II. In the above article, we came across the clear differences between anaphase I and anaphase II. Save my name, email, and website in this browser for the next time I comment.
Ecology Microbiology Science. During this step, two different sets of chromosomes are being separated and go to the opposite poles of the nucleus. During this step, the sister chromatids of the same chromosome are being separated and go towards the opposite poles of the nucleus.
During this process, the centromere is not split. It remains intact because the whole chromosome moves towards the opposite side. During this process, the centromeres of both homologous chromosomes are split because now, the chromatids of the same chromosome move in the opposite direction. In this step, spindle fibers join the centromeres of two different sets of chromosomes separately.
In this step, spindle fiber joins the single centromere of one chromosome because now the sister chromatids are required to be separated. At the end of this phase. Homologous chromosomes are found at the opposite poles of the nucleus.
At the end of this phase, sister chromatids are found at the opposite poles of the nucleus.
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