Divisão Celular

  • Paola Alessa Soares Unibrasil
Palavras-chave: cell, nucleus, genetical material, chromosomes, microtubules.


This text has as objective explain mitosis’s phases through a summarized study. Cell division’s cycle covers many satages, begining with a parent cell been duplicated, resulting at the and two daughter cells. The interphase, initial mitosis’s phase, is divided in four moments: G0 phase, been the instant when the organelle’s polarization begins in the cell; G1 phase, whereby occurs genetical material’s separation in the nucleus; S phase, responsible for genetic material’s replication and G2 phase that complete interphase with the genetical material’s union, which was replicated previously. After interphase, starts M phase, begining with prophase. At prophase, the chromosomes condenses and the spindle apparatus begins to be built outside the nucleus between two centrosomes, which were replicade and separeted. Beside organelle’s position been well defined, also occurs nucleus’s degradation. After this, the metaphase starts. That it is when occurs the disintegration of the cell’s nucleus membrane. During this phase, the chromosomes stay short and locates in the cell’s equatorial region, between the spindle poles. Beside this, the microtubules kinetochore fix the sister chromatids to the spindle apparatus’s opposites poles. At the next phase, the anaphase, occurs the sister chromatids’s separation, with the objective of form two chromosomes. Each chromosome will be pulled to their respective spindle poles, the microtubules stay short, and the spindle poles are pulled away. During the telophase, the last mitosis’s phase, the chromatids sets will arrive at the poles and be condensed. The nuclear envelope will be formed giving rise to news nucleus and the cytoplasm’s division starts with the contractile ring’s formation. We can conclude that mitosis is a division cell’s process that has five phases and may be used for healing, growth, regeneration, and gametogenisis (at the asexual reproduction).

Biografia do Autor

Paola Alessa Soares, Unibrasil
Medicina vetrinaria
Medicina Veterinária