Uyini chromatid? chromatids Ezemfundo

Uyini chromatid? Cell division ibalulekile empilweni amaningi. Ekugcineni, thina sonke idaliwe kusuka kuseli eyodwa, ngalo lahlukaniswa kaningi. Kule nqubo, kanye nucleus njengoba kukhona ushintsho oluthile kumaseli eukaryotic obiziwe mitosis futhi meiosis. Chromatids - ikhophi chromosome adalwe ngaphambi ukuqoqwa kwemibhalo.

Variability ngaphakathi kwezinhlobo

Uma kuziwa kwemvelo, ukwehluka zofuzo kuphawuleka ngokukhethekile. Ngo meiosis (inqubo ukuqoqwa kwemibhalo) ukwakheka haploid gamete amaseli - isidoda esibelethweni. ukwehluka zofuzo kwandisa ngezindlela ezimbili eziyinhloko. Okokuqala, chromosome homologous zihlukaniswe nemiyalezo ku indodakazi amaseli, ngakho kukhona inhlanganisela eziningi ngangokunokwenzeka wama-chromosomes komama kanye zoyise. recombination Homologous (exchange of ukulandelana) yindlela yesibili ukwandisa ezakhi ezinhlobonhlobo.

Kuyini chromatids: Definition

Phakathi cell division izimpindwa zihlangene nomunye endaweni ebizwa ngokuthi centromere. Uma ixhunyiwe chromatids udade abahlukene nomunye anaphase ka mitosis, each of them zuza igama elisha - chromosome indodakazi. Uyini chromatid eziphilayo? Ngokwesayensi, ke ingenye 2 nucleoprotein sesigcilikisha ezakhiwe Ukubuyelela kabili chromosome ukuthi kwenzeka ngesikhathi cell division. Bona kuyinto kwesigamu amakhophi ezimbili ezifanayo wama-chromosomes ziphindaphindwe.

chromatids Ezemfundo

Chromatin - a DNA ukuthi oboshelwe ngapha nangapha amaprotheni, kanjalo zakha isimiso Imicu yotshani Kuvunguza. Kuyinto kuzo bakha chromatid. Ngaphambi ukufanisana chromosome livela njengendlela chromatids owodwa balahleke. Ngemva ukufanisana, kuba ijwayelekile X ezimise-zonke. Iseli elinye nelinye Lomuntu iqukethe 23-chromosome ahamba ngamabili, ube nenamba Imininingwane wama-chromosomes 46.

isiphetho

Chromatid ngokuthi noma amakhophi amabili molecule ye-DNA ndawonye akha chromosome ukuthi esake ziphindaphindwe, futhi ixhunywe endaweni eyaziwa ngokuthi i-centromere. Leli gama lisetshenziswa uma nje lezi centromeres esifanayo sihlale ukuthintana ngqo. Lapho-chromosomes zihlukaniswe phakathi anaphase ka meiosis noma mitosis, le chromatids filamentous babe ngabantwana chromosome. Kalula nje, yingoba yenza-chromosomes ziphindaphindwe.