Which of the following occurs in the prophase?

These copies are referred to as sister chromatids and are attached by DNA element called the centromere. The main events of prophase are: the condensation of chromosomes, the movement of the centrosomes, the formation of the mitotic spindle, and the beginning of nucleoli break down.

What happens during prophase?

During prophase, the complex of DNA and proteins contained in the nucleus, known as chromatin, condenses. The chromatin coils and becomes increasingly compact, resulting in the formation of visible chromosomes. … The sister chromatids are pairs of identical copies of DNA joined at a point called the centromere.

What happens during prophase quizlet?

What happens during prophase? A cells genetic DNA condenses, spindle fibers begin to form and the nuclear envelope dissolves. … The duplicated chromosomes line up and spindle fibers connect to the centromeres. You just studied 9 terms!

Which of the following occurs during prophase of mitosis *?

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Term Definition
prophase first phase of mitosis during which chromatin condense into chromosomes, the nuclear envelope breaks down, centrioles separate (in an animal cell), and a spindle begins to form.
Dec 13, 2021

Which of the following occurs during the prophase of mitosis?

Prophase is the first stage in mitosis, occurring after the conclusion of the G2 portion of interphase. During prophase, the parent cell chromosomes — which were duplicated during S phase — condense and become thousands of times more compact than they were during interphase.

What occurs 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 process occurs during the prophase stage of mitosis quizlet?

What happens during Prophase? Chromatin forms into chromosomes. spindle fibers. Nuclear membrane (envelope) breaks down.

What happens during prophase I of meiosis quizlet?

What happens during prophase I of meiosis? Homologous chromosomes form and crossing over occurs between them. … Homologous chromosomes separate but sister chromatids remain joined at their centromeres. Meiosis results in genetic variation among its product cells.

What happens in prometaphase vs prophase?

In prophase, the nucleolus disappears and chromosomes condense and become visible. 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.

Is prometaphase part of prophase?

Prometaphase is the phase of mitosis following prophase and preceding metaphase, in eukaryotic somatic cells. … In sources that do not use the term, the events described here are instead assigned to late prophase and early metaphase.

Which of the following occurs in prometaphase of the cell cycle?

Prometaphase. After prophase is complete, the cell enters prometaphase. During prometaphase, the nuclear membrane disintegrates and the mitotic spindle gains access to the chromosomes. During this phase, a protein structure called the kinetochore is associated with the centromere on each sister chromatid.

Which of the following occurs prior to prophase?

Which of the following happens prior to prophase of mitosis? (1) DNA replication, (2) coiling of chromatin into chromosomes, (3) nuclear envelope disappears. How many chromosomes are in a normal human cell? Which of the following best describes the role of the spindle fibers?

What is prophase metaphase 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 chromatids are pulled to opposite poles of the cell 4) Telophase: nuclear envelope …

Which of the following events occur during Prometaphase of mitosis?

Which of the following events occurs during prometaphase of mitosis? The nuclear envelope fragments. In animal cell mitosis, the cleavage furrow forms during which stage of the cell cycle?

What three things happen during telophase?

During telophase, the chromosomes begin to decondense, the spindle breaks down, and the nuclear membranes and nucleoli re-form. The cytoplasm of the mother cell divides to form two daughter cells, each containing the same number and kind of chromosomes as the mother cell.

What does not occur in prophase?

What event does not occur in prophase of mitosis? The chromosomes are replicated. You just studied 26 terms!

What happens during telophase?

Telophase is the fifth and final phase of mitosis, the process that separates the duplicated genetic material carried in the nucleus of a parent cell into two identical daughter cells. … During telophase, a nuclear membrane forms around each set of chromosomes to separate the nuclear DNA from the cytoplasm.

What happens during prophase II?

During prophase II, the chromosomes condense, and a new set of spindle fibers forms. The chromosomes begin moving toward the equator of the cell. … The spindle fibers pull the separated chromosomes toward each pole of the cell. Finally, during telophase II, the chromosomes are enclosed in nuclear membranes.

What happens during the cytokinesis phase?

Cytokinesis is the physical process of cell division, which divides the cytoplasm of a parental cell into two daughter cells. … The contractile ring shrinks at the equator of the cell, pinching the plasma membrane inward, and forming what is called a cleavage furrow.

What are two things that happen during metaphase?

Metaphase. Chromosomes line up at the metaphase plate, under tension from the mitotic spindle. The two sister chromatids of each chromosome are captured by microtubules from opposite spindle poles. In metaphase, the spindle has captured all the chromosomes and lined them up at the middle of the cell, ready to divide.

What happen in prophase 1?

During prophase I, homologous chromosomes pair and form synapses, a step unique to meiosis. The paired chromosomes are called bivalents, and the formation of chiasmata caused by genetic recombination becomes apparent. Chromosomal condensation allows these to be viewed in the microscope.

What are the 5 stages of prophase 1?

Meiotic prophase I is subdivided into five stages: leptotene, zygotene, pachytene, diplotene, and diakinesis.

What happens in telophase II?

Telophase II: The cells pinch in the center and divide again. The final outcome is four cells, each with half of the genetic material found in the original. In the case of males, each cell becomes a sperm. In the case of females, one cell becomes an egg and the other three become polar bodies which are not used.