Ukuhlaziywa kwe-DNA ocwaningweni lwemivubukulo
Intuthuko kwezesayensi nobuchwepheshe iqhubeka nokuvula iminyango yokuqonda okujulile kwesikhathi esidlule sesintu. Enye insimu eye yazuza kakhulu ekuthuthukisweni kwezobuchwepheshe isayensi yezinto zakudala. Enye indlela eye yashintsha indlela esiqonda ngayo umlando wesintu ukuhlaziywa kwe-DNA. Lesi sihloko sizohlola indima ebalulekile yokuhlaziywa kwe-DNA ocwaningweni lwezinto zakudala, kusukela ezinzuzweni zayo kuya ezinseleleni ezibhekene nayo.
I-Pendahuluan
Isayensi yemivubukulo ihlose ukuqonda impilo yomuntu yangaphambilini ngokutholwa nokuhlaziywa kwezinto zobuciko. Nakuba izindlela ezivamile ezifana nokuhlaziywa kwezinto zobuciko kanye nokuhlolwa kwe-radiocarbon kusabalulekile, ukusetshenziswa kokuhlaziywa kwe-DNA kunikeze ukuqonda okusha okuyigugu. I-DNA, efushanisiwe ne-deoxyribonucleic acid, iyi-molecule egcina ulwazi lwezakhi zofuzo lwazo zonke izinto eziphilayo. Njengoba benekhono lokufunda nokuhlaziya i-DNA, izazi zemivubukulo manje sezingafunda izici zebhayoloji yabantu yasendulo ezazingenakwenzeka ukuziqonda ngaphambili.
Indima Yokuhlaziywa Kwe-DNA Ocwaningweni Lwezinto Ezivubukulayo
1. Ukwakhiwa Kabusha Kwesihlahla Somndeni Nokufuduka Kwaso
Omunye weminikelo emikhulu yokuhlaziywa kwe-DNA ekuvubukuleni yikhono layo lokwakha kabusha izihlahla zomndeni wabantu kanye namaphethini okufuduka. Ngokuhlaziya i-DNA evela ezinsaleleni zabantu basendulo , ososayensi bangalandelela ubudlelwano bezakhi zofuzo phakathi kwabantu abahlukene futhi baqonde ukuthi bathutha futhi bazalana kanjani. Isibonelo, izifundo ze-DNA zezinsalela ze-Neanderthal ne-Denisovan zembule ukuxubana kwezakhi zofuzo phakathi kwazo nama-Homo sapiens, okuthuthukisa ukuqonda kwethu ukusebenzisana phakathi kwezinhlobo zabantu basendulo.
2. Ukudla kanye Nempilo
I-DNA ayinikezi ulwazi kuphela ngobudlelwano bomndeni kanye nokufuduka, kodwa futhi mayelana nokudla kanye namaphethini empilo yabantu basendulo. Ukuhlaziywa kwe-DNA yamazinyo noma amathambo asendulo kungaveza amagciwane angaba nabantu abangenwe yileli gciwane, kanye nolwazi mayelana nokudla kwabo. Isibonelo salolu hlelo lokusebenza ukutholakala kwe-DNA evela kumagciwane afana ne-Yersinia pestis, eyabangela isifo se-bubonic eYurophu yasendulo, ezinsaleleni zabantu, okuvumela ukulandelwa kokusabalala kwalesi sifo.
3. Ukuziphendukela Kwemvelo Nokuzivumelanisa Nezimo
Ukuhlaziywa kwe-DNA kuhlinzeke nokuqonda okusha ngokuziphendukela kwemvelo kwabantu kanye nokuzivumelanisa nezimo . Izinguquko zezakhi zofuzo ezivumela ukuzivumelanisa nezimo ezithile, njengokubekezelela ubisi ezindaweni ezifuywayo noma ukuzivumelanisa nezindawo eziphakeme ezindaweni ezihlala eHimalaya, zingafundwa ngokuhlaziywa kwe-DNA. Lokhu kunikeza ukuqonda kokuthi abantu baye bazivumelanisa kanjani nezinguquko zezemvelo emlandweni wabo.
Indlela Yokuhlaziya i-DNA
1. Ukukhishwa kwe-DNA
Inqubo yokuhlaziya i-DNA iqala ngokukhishwa kwe-DNA kumasampula ezinto zakudala, okungaba amathambo, amazinyo, noma izicubu ezithambile ezingcwatshwe phansi ezimweni ezinhle zokulondolozwa. Izinselele ezinkulu kulesi sigaba ukungcoliswa kwe-DNA yesimanje kanye nokuwohloka kwe-DNA yasendulo. Amasu anjenge-Polymerase Chain Reaction (PCR) asetshenziselwa ukukhulisa izingcezu ze-DNA ukuze kutholakale izinto ezanele zokuhlaziya.
2. Ukuhlaziywa Kokulandelana kanye Nokuhlaziywa Kwe-Bioinformatics
Ngemva kokukhishwa kwe-DNA nokukhuliswa kwayo, isinyathelo esilandelayo ukulandelana, okuhilela ukufunda ukulandelana kwezisekelo ze-nucleotide ku-DNA. Ubuchwepheshe besimanje bokulandelana, njengokulandelana kwesizukulwane esilandelayo (NGS), buvumela izigidi zezingcezu ze-DNA ukuthi zifundwe ngasikhathi sinye. Le datha yokulandelana ibe isihlaziywa kusetshenziswa amathuluzi e-bioinformatics ukuhlonza amaphethini ezakhi zofuzo kanye nobudlelwano bokuziphendukela kwemvelo.
Isicelo Sesifundo Secala
1. UJomon Man
Ucwaningo oluvelele lwe-DNA ukuhlaziywa kwezinsalela zabantu baseJomon, omunye wezakhamuzi zasendulo zaseJapan. Ukuhlaziywa kwabo kwe-DNA kwembule ubuhlobo obuseduze bezakhi zofuzo nama-Ainu anamuhla, okunikeza ukuqonda okubalulekile ngemvelaphi yobuzwe kanye nokufuduka kwalesi sifunda.
2. Inyamazane yamaViking
Olunye ucwaningo oluthakazelisayo luhilela i-DNA evela ezindaweni zokungcwaba amaViking. Ukuhlaziywa kwe-DNA kubonise ukuthi amaViking ayenobudlelwano obuhlukahlukene bezakhi zofuzo, okuhlanganisa ingxube yezakhi zofuzo ezivela eScandinavia, eMpumalanga Yurophu, ngisho nasesifundeni saseMedithera. Lokhu kusikisela ukuthi amaViking ayeyiqembu labantu abahlukahlukene kunalokho okwakucatshangwa ngaphambili.
Izinselele kanye nokulinganiselwa
Naphezu kwezinzuzo zayo ezibalulekile, ukuhlaziywa kwe-DNA kwezemivubukulo akunazo izinselele kanye nemikhawulo. I-DNA yasendulo ivame ukuwohloka futhi ingcoliswe yi-DNA yanamuhla, okungaphazamisa ukuhlaziywa. Ngaphezu kwalokho, ukuhumusha idatha yezakhi zofuzo kudinga ukucophelela okukhulu ukuze kugwenywe amaphutha ekuboneni ubudlelwano bezakhi zofuzo kanye nokufuduka kwazo.
Izindaba zokuziphatha nazo azinakwa, ikakhulukazi uma kukhulunywa ngokuqoqa amasampula e-DNA ezinsaleleni zabantu basendulo . Kubalulekile ukuhlonipha isiko namasiko emiphakathi ehilelekile nokuthola imvume efanele ngaphambi kokwenza ukuhlaziywa.
Isiphetho
Ukuhlaziywa kwe-DNA kuvule inkathi entsha ocwaningweni lwezinto zakudala, okuvumela ososayensi ukuthi bathole ukuqonda okujulile ngempilo yomuntu wangaphambilini . Amandla ayo okwakha kabusha amaphethini okufuduka, ubudlelwano bomndeni, ukudla, impilo, kanye nokuziphendukela kwemvelo kwabantu kanye nokuzivumelanisa nezimo kuye kwacebisa ukuqonda kwethu umlando wesintu.
Kodwa-ke, izinselele kanye nemikhawulo yokuhlaziywa kwe-DNA yasendulo kudingeka kuxazululwe njalo ngokuthuthukiswa kobuchwepheshe kanye nezindlela ezithuthukisiwe. Ngendlela ecophelelayo nenesimilo, ukuhlaziywa kwe-DNA kunamandla okuqhubeka nokuguqula indlela esibheka futhi siqonde ngayo isikhathi esidlule sesintu. Lokhu kubonisa ukuthi intuthuko yezobuchwepheshe ingaletha ulwazi lwesikhathi esidlule ezingeni elisha lokucaca nemininingwane.
