Tajdid chist? (reproduksiya)

Tajdid dar natijai afzoishi gayrijinsi va jinsii fardho ba vuqu mepayvandad. Nasli organizmhoi zinda, odatan ba volidonashon monand meboshand. Masalan, az gurba – gurbacha, az sag – sagbacha tavlid meshavad, az doni gandum – gandum va az tukhmi (donai) jav – jav meruyad. Amyobai yakhujayra dar vaqti afzoish ba du qism taqsim meshavad, ki onho ba hujayrai modari purra monand meboshand.

Hamin tavr, afzoish khosi organizmi zinda buda, dar ravandi on organizmi ba khud monand ba vujud meoyad.

Dar natijai tajdid nafaqat organizmhoi tom, balki hujayra va organellahoi on (mitokhondriya, plastidho va gayra) niz badi taqsimshavi ba avlodi khud monand megardand. Hangomi taqsimshavii KDN az yak molekulai on du molekulai dukhtari paydo meshavad, ki purra takrori shakli avvala meboshand.

Asosi tajdid ba reaksiyai sintezi qolabi (matritsa) vobasta ast, yane molekulahoi nav dar asosi akhbori paydarhami dar KDN vujuddoshta paydo meshavand. Pas, malum megardad, ki tajdid yake az khosiyathoi muhimi organizmhoi zinda buda, ba irsiyat robitai nogusastani doshtaast.