Question

What are the stages of the cell cycle? What is happening in each one?

Interphase + Mitosis + Cytokinesis = cell cycle • Interphase: subdivided into G1, S, and G2 phases. What happens during each?

Mitosis: Stages of each in order. Events of each stage. Identify the stage that a cell is in from an image of a cell (Figure 11.4) • What happens after telophase and cytokinesis? What part of the cell cycle does the cell continue into?

Answer 1

Cell cycle consist of interphase that consist of (G1, S, G2 phase), M phase, cytokinesis. Interphase is consist of G1 phase which is the phase of cell growth, after that come S phase is consist of DNA synthesis, followed by G2 phase which is again the process of cell growth. Mitotic phase come after interphase, which leads to the formation of two daughter cells followed by cytokinesis.

During G1 phase, cell grow in size, organelles are copied and various proteins are made that are required for cell division.

During S phase, DNA replicate along with centrosome.

During G2 phase, cell grow in size, start proteins require for the cell for entering in Mitosis phase.

Stages of each in mitosis include interphase, prophase, metaphase, anaphase, Telophase.

During interphase, cell prepare itself for division.

During, prophase, chromosome get condensed. Mitotic spindle start to form.

At the start of metaphase, nuclear envelope breakdown, condensed chromosome line up along the elongated cell equator.

During anaphase, pairs of sister chromatids moves to opposite poles of the cell which is elongated.

During Telophase, nuclear envelope again formed. Nucleolus reappear. Both the set of duplicated chromosome get enclosed in nuclear envelope. Each newly formed cell have same number of chromosome.

During cytokinesis, dividing cell is separated into two cells with the help of proteins called as myosin and actin. Cytoplasm is equally divided in to both the newly formed cells.

After the cytokinesis, cell again undergoes the G1 phase.