Question

Помогите срочно плиииииииииииииииз набор хромосом ,ДНК митоз: профаза,метафаза,анафаза,телофаза,интерфаза только набор хромосом ,ДНК

Answer 1

(n) - Количество хромосом:
Начало и конец Интерфазы - 2n
Профаза - 2n
Метафаза - 2n
Анафаза - 4n
Телофаза - 2n
(с) - Количество ДНК:
Начало Интерфазы - 2с
Конец Интерфазы - 4с 
Профаза - 4с
Метафаза - 4с 
Анафаза - 4с
Телофаза - 2с

Answer 2

The Cell Cycle and Mitosis

The cell cycle is the process by which cells grow, replicate their DNA, and divide into two daughter cells. It consists of several phases, including interphase and mitosis. Mitosis is the phase of the cell cycle where the nucleus divides, and the chromosomes are distributed equally between the two daughter cells.

Interphase

Interphase is the longest phase of the cell cycle and can be further divided into three stages: G1, S, and G2. During interphase, the cell grows, carries out its normal functions, and replicates its DNA in preparation for cell division. The chromosomes are in the form of loosely packed chromatin during interphase.

Prophase

Prophase is the first stage of mitosis. During prophase, the chromatin condenses and becomes visible as distinct chromosomes. The nuclear envelope breaks down, and the spindle apparatus, composed of microtubules, begins to form. The centrosomes move to opposite poles of the cell, and the mitotic spindle fibers attach to the chromosomes.

Metaphase

Metaphase is the second stage of mitosis. During metaphase, the chromosomes align along the equator of the cell, known as the metaphase plate. The spindle fibers attach to the centromeres of the chromosomes, ensuring that each chromosome is properly aligned for separation.

Anaphase

Anaphase is the third stage of mitosis. During anaphase, the sister chromatids of each chromosome separate and move towards opposite poles of the cell. The spindle fibers shorten, pulling the chromatids apart. At the end of anaphase, each pole of the cell has a complete set of chromosomes.

Telophase

Telophase is the final stage of mitosis. During telophase, the chromosomes reach the opposite poles of the cell. The nuclear envelope reforms around each set of chromosomes, and the chromosomes begin to decondense back into chromatin. The spindle apparatus disassembles, and cytokinesis, the division of the cytoplasm, begins.

Cytokinesis

Cytokinesis is the process by which the cytoplasm divides, resulting in two daughter cells. In animal cells, a cleavage furrow forms, and the cell membrane pinches inward until the cell is divided into two. In plant cells, a cell plate forms in the middle of the cell and eventually develops into a new cell wall, separating the two daughter cells.

Conclusion

In summary, the cell cycle consists of interphase and mitosis. During mitosis, the chromosomes go through several stages: prophase, metaphase, anaphase, and telophase. These stages ensure the proper distribution of chromosomes between the two daughter cells. Interphase is the phase where the cell grows and replicates its DNA in preparation for cell division.