Table of Contents
- 1 In what phase of meiosis do spindle fibers attach to chromosomes?
- 2 In which stage does the spindle attach to the centromeres?
- 3 During which stage of meiosis do centromeres divide?
- 4 What is the g2 phase of interphase?
- 5 Where do spindle fibers attach to chromosomes during meiosis?
- 6 How are chromosomes lined up in prometaphase and anaphase?
In what phase of meiosis do spindle fibers attach to chromosomes?
Metaphase
Metaphase. During metaphase, spindle fibers attach to the centromere of each pair of sister chromatids (see Figure below). The sister chromatids line up at the equator, or center, of the cell. This is also known as the metaphase plate.
In which stage does the spindle attach to the centromeres?
Metaphase follows prophase. During metaphase, the chromosomes align in the center of the cell at the equatorial plate and the spindle fibers attach to the centromeres of the chromosomes. Anaphase involves the retraction of the spindle fibers and the separation fo sister chromatids.
Where do spindle fibers attach in meiosis?
kinetochore
They attach at a point called the kinetochore, which is a disk or protein that is on each side of the centromere. The spindle fibers will move the chromosomes until they are lined up at the spindle equator.
In what phase of meiosis do spindle fibers attach to centromeres of Tetrads?
Metaphase I
Metaphase I: In metaphase I of meiosis, the tetrads align on the equatorial plate (as in mitosis). The centromeres attach to spindle fibers, which extend from the poles of the cell. One centromere attaches per spindle fiber.
During which stage of meiosis do centromeres divide?
anaphase II
In meiosis centromere divides during anaphase II.
What is the g2 phase of interphase?
G2 phase is a period of rapid cell growth and protein synthesis during which the cell prepares itself for mitosis. Curiously, G2 phase is not a necessary part of the cell cycle, as some cell types (particularly young Xenopus embryos and some cancers) proceed directly from DNA replication to mitosis.
What must happen to the centromeres before the chromatids can separate?
Sister Chromatids Are Joined Together at Centromeres For accurate mitoses, sister chromatids must remain attached until the spindle checkpoint has been passed. As a cell enters anaphase, cohesin is precipitously degraded, and the cell’s sister chromatids separate to opposite poles of the spindle.
Do centromeres split in meiosis?
(Meiosis 1) Prophase I, Metaphase I, Anaphase I, Telophase I; (Meiosis 2) Prophase II, Metaphase II, Anaphase II and Telophase II. The centromeres split during anaphase.
Where do spindle fibers attach to chromosomes during meiosis?
Spindles extend from centrioles on each of the two sides (or poles) of the cell, attach to the chromosomes and align them, and pull the sister chromatids apart. Where do spindle fibers attach during meiosis? The spindle fibers from the other side of the cell attach to the other sister chromatids of the chromosome.
How are chromosomes lined up in prometaphase and anaphase?
In prometaphase, kinetochores appear at the centromeres and mitotic spindle microtubules attach to kinetochores. In metaphase, chromosomes are lined up and each sister chromatid is attached to a spindle fiber. In anaphase, sister chromatids (now called chromosomes) are pulled toward opposite poles.
Where are the two sister chromatids of a chromosome connected?
The two sister chromatids of a chromosome are connected in the center of the chromosome, called the centromere. Microtubules called spindle fibers begin extending from the centrosomes and begin to attach to the kinetochores of the chromosomes, which are at the centromeres (centers) of the chromosomes.
What are the gametes in the process of meiosis?
The process of meiosis creates 4 haploid gamete cells from a diploid cell. In animals these gametes are called eggs and sperm and in plants they are called eggs and pollen. For meiosis to occur it must go through two divisions, Meiosis I and Meiosis II.