Question

with the help of suitable diagram decreibe the cell cycle​

Answer 1

Answer:

The sequence of events in which the cell prepares its machinery for its division is the cell cycle. The nutrient and enzymes required for the events are all synthesized and the process is such that the two daughter cells receive even constituent.

Explanation

The cell cycle involves a larger preparatory phase called interphase and a division phase called the Mitotic (M) phase.

Interphase is further divided into three phases called G1-phase, S-phase, and G2-phase. The G1 phase is also called the first gap phase in which the cell grows bigger, cell organelles are copied, synthesis of mRNA and proteins required in subsequent steps of the cell cycle.

In S-phase, DNA replication is carried out in the nucleus of the cell. A structure that organizes the microtubules called centromere is also replicated in this phase. This will be used in the mitosis process for the separation of duplicated chromosomes or chromatids.

G2-phase prepares the cell for division either mitosis or meiosis. The cell content is reorganized.

After the growth phase, the cell enters the M phase in which both nucleus and cytoplasm divide to produce two daughter cells.

The four phases of the mitosis taking place in somatic cells are prophase, metaphase, anaphase, and telophase. A checkpoint at metaphase ensures that the cell is ready to divide.

Prophase: In this phase chromosomes start to condense, mitotic spindle starts forming, the nucleolus disappears and the nuclear envelope breaks down to get the chromosomes released.

Metaphase: the chromosomes lined up at the equator (metaphase plate) and two kinetochores of the chromatid get attached to spindle poles on the polar ends of the cell.

Anaphase: Sister chromatids are pulled apart to get separated and cell enlarges. Motor proteins assist in this.

Telophase: spindle fibres disappear in this phase, decondensation of chromosome takes place, nucleolus reappears and nuclear membrane begins to form.

Cytokinesis starts in either anaphase or telophase in which cytoplasm divides between the two cells.

The phases of meiosis I are the same as mitosis, so the sequence of events will be the same in meiosis I, taking place in germ cells.