Does prophase or prometaphase come first?
The mitotic spindle is made of long proteins called microtubules that begin forming at opposite ends of the cell. The spindle will be responsible for separating the sister chromatids into two cells. Prophase is followed by the second phase of mitosis, known as prometaphase.
Is prometaphase part of prophase?
Some textbooks list five, breaking prophase into an early phase (called prophase) and a late phase (called prometaphase). These phases occur in strict sequential order, and cytokinesis – the process of dividing the cell contents to make two new cells – starts in anaphase or telophase.
What is the order for prophase?
Mitosis has four sequential stages: prophase, metaphase, anaphase, and telophase. In prophase, each chromosome becomes condensed and more visible, and there is the breakdown of the nuclear membrane and appearance of spindle fibers. In the next phase, metaphase, the chromosomes line up along the metaphase plate.
What happens to centrosomes during prometaphase?
At prometaphase (late prophase) the chromosomes condense inside the nuclear envelope and asters of fibers appear on the outside of the chromosomes. … The centrosome replicates in late G1 and S phases and the pair can be observed just outside the nuclear envelope.
What happens in prometaphase and metaphase?
During prometaphase the nuclear envelope breaks down, allowing the kinetochore microtubules in the spindle to attach to the chromosomes. During metaphase the chromosomes are aligned at the equator of the cell midway between the centrosomes. …
Which of the following occurs during prometaphase?
What Happens during Prometaphase? When prophase is complete, the cell enters prometaphase — the second stage of mitosis. During prometaphase, phosphorylation of nuclear lamins by M-CDK causes the nuclear membrane to break down into numerous small vesicles.
What happens during prometaphase?
During prometaphase, the physical barrier that encloses the nucleus, called the nuclear envelope, breaks down. The breakdown of the nuclear envelope frees the sister chromatids from the nucleus, which is necessary for separating the nuclear material into two cells.
Which of the following occur during prophase prometaphase of mitosis in animal cells?
The correct answer is d.)
The replication of chromosomes occurs in interphase of mitotic division. The 2N chromosomes change into 4N chromosomes to indicate that the cell is ready for division. Prometaphase is the late stage of prophase and early stage of interphase. All other options are applicable to prometaphase.
What are the 4 stages of cell cycle?
In eukaryotes, the cell cycle consists of four discrete phases: G1, S, G2, and M. The S or synthesis phase is when DNA replication occurs, and the M or mitosis phase is when the cell actually divides. The other two phases — G1 and G2, the so-called gap phases — are less dramatic but equally important.