EXPLANATION TEXT

Halluuuwww….

Ini nih, tugas explanation text sewaktu kelas dua belas. Sebetulnya ini aku bentuknya dalam power point dan satunya di kertas A4 plus gambar-gambarnya. Tapi, biar jadi bahan pembelajaran aja daripada Cuma disimpen dalam file dan Cuma jadi kenangan masa SMA…hiks, hiks. Jadi, Ginko posting aja di sini…

EXPLANATION OF
CELL DIVISION MITOSIS

General Statement

•       The ability of organism to reproduce their kind is the one of characteristic that most distinguished between living thing and nonliving thing. The life of cell started from mother cell fission until self-fission to be two parts. Mitotic cell division alternately from interphase to mitotic phase.

EXPLANATION 1

•                       Interphase is divided into G1 phase, S phase, and G2 phase. In this three sub phase, cell grows by producing protein and organelles in G1 (Gap 1 phase), then chromosome duplicated during S phase (synthesis phase) and keep on growing until the cell finishing the preparation to fission. During the end of interphase, nucleus has been formed clearly and wrapped with nucleus membrane. Outside the nucleus there are two centrosome and microtubules. Microtubules are extension centrosome that spreads radially.

EXPLANATION 2

•                       Mitotic phase begins with prophase. Chromatin shortens and thickens into chromosomes, nucleolus disappear. Each duplicated chromosome appears as two chromatids sister. Mitotic spindle made ​​of microtubules begin to form and centrosome getting far away.

EXPLANATION 3

•                       During prometaphase, Nucleus membrane fragmented. Microtubules from the spindle interact with chromosomes. Each of the two chromatids of a chromosome has a kinetochore located at the centromere.

EXPLANATION 4

•                       In Metaphase, centrosome are at polar division and chromosomes lined up on the equatorial called metaphase plate.

EXPLANATION 5

•                       Anafase starting when pair sentromere of each chromosome separate and release the sister chromatid toward the opposite cell poles because the kinetochore microtubules are shorten. Nonkinetochore microtubules lengthen, so pole cells migrate farther. Now both polar cells have equivalent and complete chromosome.

EXPLANATION 6

•                       At telophase, daughter nucleus begin to form at the two poles. Nucleus membrane is formed again from the fragments of the parent cell’s nucleus membrane and other portions of the endomembrane system. The chromosomes become less tightly coiled then followed by the cleavage of the cytoplasm, cytokinesis so that two daughter cells separate at the end of mitosis.

CONCLUSION

•                        The life of cell started from mother cell fission until self-fission to be two parts. The step of cell division are Interphase and mitotic phase.

Source: Campbell, dkk