What causes the chromosomes to align in the middle of the cell?
During mitosis, chromosomes are bound to microtubules emanating from both poles of the mitotic spindle via sister-kinetochores and aligned on the metaphase plate precisely in the middle of the spindle. The equatorial position of the metaphase plate is a distinctive feature of metazoan, plant, and many fungal cells.
What is it called when the chromosomes lineup in the middle of the cell?
Metaphase (the shortest phase of mitosis) is characterized by two events: Chromosomes line up across the middle of the cell. Spindle fibers connect the centromere of each sister chromatid to the poles of the cell.
What aligns the chromosomes along the metaphase plate?
Microtubules are responsbile for moving Chromosomes to the metaphase plate. During Prometaphase, microtubules grow into a region around the Chromosomes until they find a Kinetochore. A Microtubule from each spindle pole connects to the kinetochore of each Chromosome.
Why is it so important that all of the chromosomes align on the metaphase plate during metaphase?
Why is it so important that all of the chromosomes align on the metaphase plate during metaphase? If they cannot, it suggests that they aren’t properly attached to the spindle microtubules, and thus won’t separate properly during anaphase. … The resulting daughter cells would have different numbers of chromosomes.
Which stage of mitosis and meiosis does the alignment of the centromeres occur?
During metaphase, the microtubules pull the sister chromatids back and forth until they align in a plane, called the equatorial plane, along the center of the cell. During anaphase, the sister chromatids are separated simultaneously at their centromeres.
What are the 4 stages of mitosis and what happens in each?
There are four stages of mitosis: prophase, metaphase, anaphase and telophase.1) Prophase: chromatin into chromosomes, the nuclear envelope break down, chromosomes attach to spindle fibres by their centromeres 2) Metaphase: chromosomes line up along the metaphase plate (centre of the cell) 3) Anaphase: sister …
In which phase do the chromosomes line up in the middle of the cell quizlet?
Homologous chromosomes line up at the center of the cell (Metaphase=They MEET in the MIDDLE) Equator of cell.
What lines up at the center of the cell during meiosis?
Explanation: In metaphase I, homologous chromosomes line up along the center of the cell in order to be pulled apart. Recall that during meiosis I, homologous chromosomes pair, cross over, and separate. Meiosis II is when the sister chromatids are separated.