Examine the picture below. 1. Draw out the segments of normal eukaryotic cell cycle. 2. What stage of the cell cycle is represented below? What is the percentage of cells in each stage of the cell cycle? What parts of the cell cycle are not present in the image? What is the percentage of cells that you cannot identify? Explain how you answered the question.

Examine the picture below 1 Draw out the segments of normal eukaryotic cell cycle 2 What stage of the cell cycle is represented below What is the percentage of class=

Respuesta :

The two main phases of cell cycle are the interphase and the mitotic phase.

What is a cell cycle?

  • Cell cycle is an ordered series of events that involve cell division producing two new daughter cells.
  • The 2 phases of cell cycle are interphase (G1, S, G2) and mitotic phase (Prophase, Prometaphase, Metaphase, Anaphase, Telophase).
  • During interphase, the cell grows in size and replication of DNA takes place.  
  • In G1 cell growth and protein synthesis occurs, in S phase DNA is replicated and in G2 there is further growth and protein synthesis.
  • During Mitosis, nucleus divides and the duplicated chromosomes are distributed into daughter nuclei. Usually after mitosis, the cell will divide (Cytokinesis) which involves the division of cytoplasm and two daughter cells are formed.
  • The following events occur during different phases of mitosis: Sister chromatids line up in a plane at the equatorial plate (Metaphase).  Sister chromatids separate and move to opposite poles (Anaphase). The nucleus reforms (Telophase) and the cell divides.

The given diagram represents Metaphase stage of cell cycle.

  • During metaphase, all of the chromosomes are aligned in a single plane at the equator (equatorial plane). During this phase the chromosomes are most condensed. The sister chromatids are joined to each other via the centromere.

To calculate the percentage of cells during each stage, first count the number of cells in each phase. Then, divide the total number of cells in each phase by the total number of cells present and multiply by 100.

There are 28 cells in total.

Out of which 21 are in Metaphase and 7 cannot be identified.

Percentage of cells in metaphase= (21/28)* 100 = 75%

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