Question

A certain mammalian cell, the fibroblast, takes 24 hours to divide. How many hours would such a cell be expected to spend in mitosis

Answer 1

The cell will spend 3.6 hours in mitosis ( B )

Given that cell division occurs in 4 stages and mitosis takes about 15% of the total time required for cell division from the pie chart presented in the question.

What is Mitosis ?

Mitosis is the division of a parent cell into two daughter cells ( identical ).And the purpose of this process in a cell are;

• Growth   and
• cell replacement

If A certain Mammalian cell takes about 24 hours to divide the number of hours that the cell will spend in mitosis will be ;

= 15% * 24

= 15 /100 * 24

= 3.6 hours

Hence we can conclude that the cell will spend 3.6 hours in mitosis

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Answer 2

Mitosis

Mitosis happens when a parent cell divides, creating two identical copies, referred to as daughter cells. During this process, it is essential that the daughter cells are exactly the same with the same copies of DNA.

The period between one division and another is called interphase, which occupies approximately 95% of the cell cycle time. In this one, there are three phases:

• - G1: when there are no activities related to the division;

• - S: where DNA duplication occurs;

• - G2: end of DNA duplication, preceding mitosis itself.

Mitosis lasts approximately 45 minutes and is conventionally divided into: prophase, metaphase, anaphase and telophase, the last event being cytokinesis, which corresponds to the division of the cytoplasm.

Phases in mitosis

• In prophase, the chromosomes condense, making them shorter and thicker. These - duplicated at the interphase and called, now sister chromatids, joined by the centromere - become visible under the microscope. The nucleoli disappear; the mitotic spindle, a set of microtubules located at the poles of the cell, forming fibers, begins to form. At the end of the prophase, the caryotheca is broken and the chromatids are spread throughout the cytoplasm.

• In metaphase, the fibers reach the region occupied by the nucleus. Some microtubules of polar fibers bind to protein structures present in the centromere region, called kinetochores. Thus, there is a progressive displacement of the chromatids towards the equatorial region of the cell, forming the metaphase plate, or equatorial plate, where they are aligned.

• Anaphase is the separation of centromeres, separating two chromatids of each chromosome, thus being called sister chromosomes. These go to the opposite poles of the cell, with the help of the spindle fibers, as their microtubules shorten.

• In telophase, there is again the condensation of chromosomes and the reorganization of the nucleolus and caryotheca - it is situated around each chromosome set, which decondense.

with that, the correct answer is that the duration of mitosis in this cycle is 45 minutes

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