A akanta na mitosis

A akanta na mitosis ne sosai high. Neposveschennomu ko da wuya su yi tunanin irin rawa a cikin rayuwar wani sauki aiwatar da cell division a cikin jiki. Da ikon na sel rabawa - wannan shi ne mafi muhimmanci na da aiki, tamkar. Ba tare da wannan ba shi yiwuwa ci gaba da rayuwa a duniya, da kara yawan guda-celled kwayoyin ba zai iya ci gaba, da kuma ci gaba wanzuwar manyan kwayar kwayoyin, mai yiwuwa ba ne a matsayin jima'i haifuwa ta hanyar ci gaban da sabon rai da kuma na kwan da ya hadu.

A akanta na mitosis zai zama da yawa kasa idan cell division ya ba jigon da rinjaye faruwa a wannan duniya tamu nazarin halittu tafiyar matakai. Wannan tsari faruwa a dama, saukarwa. Kowace daga cikinsu hada da dama ayyuka a cikin cell. A sakamakon wannan ne m multiplication da kwayoyin akai na sel guda a rabin ta wajen maimaita DNA to baya haifi iyaye cell zuwa biyu yar.

A dukan rai na a cell za a iya kammala a lokacin daga cikin samuwar wani na biyu zuwa ta m division cikin biyu. Wannan lokaci ne a ilmin halitta da aka sani da "cell sake zagayowar".

The sosai rukunin farko na mitosis - dace shiri domin cell division. Period a cikin abin da Kwayoyin suna baiwa kernels yi kai tsaye shiri domin division, kira Interphase. Sai ya faru duk da mafi muhimmanci - wato, maimaitawan wannan DNA strands da kuma da sauran fannin jiki, kazalika da kira na manyan yawa na gina jiki. Saboda haka, tantanin halitta chromosomes ake ninki biyu, kuma kowane rabin na biyu chromosome ake kira "chromatid".

Bayan Interphase fara kai tsaye aiwatar da division - mitosis. Ya, ma, faruwa a dama, saukarwa. A sakamakon haka, duk da ninki miƙa symmetrically a cikin keji, don bayan samuwar na tsakiyar bangare a kowane sabon cell kafa wannan adadin aka gyara sauran.

Da kasoshin lokatan mitosis da meiosis ne irin wannan, amma a karshen (ta rarraba jam sel) yana Ƙungiyarku biyu, kuma a karshen shi dai itace ba biyu ba, amma hudu kletki "yar." Har ila yau, kafin na biyu division offline chromosome maimaitawan, don haka su rabin sa ya zauna a cikin 'yar Kwayoyin.

1. Prophase. A wannan lokaci, Kwayoyin centrioles ne sosai a bayyane. Su ne kawai ba a cikin cell na dabbobi da mutane. A tsire-tsire ba da centrioles.
2. prometaphase. A wannan lokaci shi ƙare prophase da metaphase fara.
3. Metaphase. A wannan lokaci, da chromosomes karya a kan "ekweita" na cell.
4. Anaphase. Chromosomes tashi zuwa daban-daban zura sandunan ɗaukarsa.
5. Telophase. Daya cell-da "uwa" da aka raba ta da samuwar wani tsakiyar bangare a cikin biyu kletki "yar." Kamar wancan kammala cell division ko mitosis.

A mafi muhimmanci akanta na mitosis - shi ne daidai da wannan rabo daga cikin ninninkuwa chromosomes cikin 2 daidai sassa da kuma tunzura su a cikin biyu kletki "yar." Daban-daban na Kwayoyin da sel daban-daban kwayoyin da duration jere lokaci division - mitosis, amma a kan talakawan yana daukan game da daya da rabi hours. Akwai da yawa abubuwan da tasiri wannan sosai m tsari. Duk wani canza muhalli yanayi, msl, yanayi zazzabi, haske lokaci yanayin, da matsa lamba a cikin yanayi kuma a cikin wani kwayoyin da Kwayoyin kazalika da yawa wasu dalilai iya muhimmanci shafi duka da duration da kuma ingancin da aiwatar da cell division. Har ila yau, tsawon lokacin da mitosis kuma duk da mutum, saukarwa iya zama kai tsaye dogara a kan nama irin, a Kwayoyin wanda ya ci gaba da gudana.

A akanta na mitosis tare da kowane sabon samu a fagen cytology zama mafi muhimmanci, saboda ba tare da wannan tsari ba zai iya zama rayuwa a duniya.