Denisovci
Osim Neandertalaca koje smo ranije spominjali vremenski posljednji srodnik Homo sapiensa su bili Denisovci. Oni su izumrla vrsta iz roda Homo koja je tijekom paleolitika živjela na području Azije.
Znanost nam još uvijek nije u stanju dati odgovore na mnoga pitanja o evoluciji Homo sapiensa, modernih ljudi. Jedno od pitanja na koje ne postoje odgovori se bavi samim nastankom naše vrste. Postojeći znanstveni konsenzus nam govori da mi svi potičemo od Homo erectusa i tu on staje nakon čega idemo u pretpostavke.
Glavna znanstvena pretpostavka nam govori da je Homo heidelbergensis potomak Homo erectusa, a svi ostali su njegovi potomci. Time želimo reći da nam trenutačna znanost govori da su Homo vrste; Sapiens, Neandertalac i Denisovan evolucijski potomci Heidelbergensis.
Sapiens je potomak koji se od njega razvio u Africi, Neandertalac u Europi i Denisovan u Aziji. Na kraju Sapiens je iz nama nepoznanih podataka postao daleko najuspješnije vrsta koja se proširuje po svom planetu. Tijekom svog širenja naši preci su potiskivali, uništavali druge vrste, ali su se istovremeno s njima i parili. Rezultat tog parenja postaje da autohtoni Europljanin ima i dio obilježja Neandertalaca kao na primjer njihove plave oči.
To su povjesničari napokon prihvatili tek 2022. kada Svante Paabo dobiva Nobelovu nagradu za genetiku Neandertalaca. Nešto slično se dogodilo i s Denisovcima u Aziji samo što tamo imamo još kompliciraniju sliku.
Kao što smo ranije rekli Denisovci i Neandertalci su navodno potomci Homo heidelbergensis, ali tome nismo dodali da su oni stotinama tisućama godinama bili jedini potomci koji žive u Euroaziji. To znači da su se oni ako ništa drugo desecima tisućama godinama mješali pa su na kraju bili genitički bliži jedni drugima nego Sapiensu.
Još 2018. su znanstvenici otkrili dokaz tog zajedničkog života Neandertalaca i Denisovana u tadašnjim graničnim područjima, a kasnije je to još potvrđeno.
Kako se Denisovci živjeli oko 200 000 godina u Aziji oni su se tokom vremena prilagodili tamošnjoj klimi. Jedna od prilagodbi je bila život na više od 4 000 metara visokom Tibetu. Za tamo živjeti oni su razvili gen nazvan EPAS1 koji im je omogućavao veću efikasnost u korištenju kisika kako bi mogli živjeti na Tibetu.
Riječ je o genu koji zahvaljujući parenju između Sapiensa i Denisovaca nasljeđuju Tibetanci i Han Kinezi. Znanstveni dokaz tog nasljeđivanja tog preuzimanja gena Denisovanaca smo dobili početkom srpnja 2024.
Svoj genetički trag Denisovci nisu ostavili samo na Tibetu nego i u cijeloj istočnoj Aziji. Najviše tog traga je ostalo među stanovnicima Papue Nove Gvineje gdje on čini 5 % tamošnjeg genoma. Istovremeno ostali stanovnici prije svega istočne Azije imaju samo između 0.2 i 2% genoma Denisovanaca.
Ukratko ti maleni postotci predstavljaju temeljnu genetičku razliku između autohtonih stanovnika Azije, Europe i subSaharske Afrike. Autohtoni stanovnici prvih navedenih imaju mali udio genetičkog matirjala Denisovaca, drugih Neandertalaca, a trećih niti jednih od njih.
Thank you for sharing. I share your level of appreciation for the work you’ve completed. The painting you’ve revealed is exquisite, and the material you’ve written is sophisticated. You appear to be concerned about heading in a direction that could be seen as questionable. I recommend that you resolve this issue quickly.
Wow amazing blog layout How long have you been blogging for you made blogging look easy The overall look of your web site is magnificent as well as the content
My brother recommended I might like this web site He was totally right This post actually made my day You cannt imagine just how much time I had spent for this information Thanks
Hi my family member I want to say that this post is awesome nice written and come with approximately all significant infos I would like to peer extra posts like this
My admiration for your creations is as substantial as your own sentiment. The visual presentation is tasteful, and the written content is sophisticated. Yet, you seem uneasy about the possibility of presenting something that may cause unease. I’m confident you’ll be able to resolve this issue efficiently.
I was just as enthralled by your work as you were. The visual presentation is refined, and the written content is sophisticated. However, you seem anxious about the possibility of presenting something that could be perceived as questionable. I believe you’ll be able to rectify this matter in a timely manner.
I do agree with all the ideas you have introduced on your post They are very convincing and will definitely work Still the posts are very short for newbies May just you please prolong them a little from subsequent time Thank you for the post
The Best Premium IPTV Service WorldWide!
Thank you for sharing superb informations. Your web site is so cool. I’m impressed by the details that you have on this website. It reveals how nicely you perceive this subject. Bookmarked this website page, will come back for extra articles. You, my pal, ROCK! I found just the information I already searched all over the place and simply couldn’t come across. What a perfect web site.
I went over this website and I think you have a lot of good information, bookmarked (:.
Thank you a lot for providing individuals with a very memorable chance to read critical reviews from here. It’s usually very excellent and jam-packed with a great time for me and my office peers to search your site particularly thrice in one week to read the new guidance you have. And indeed, I’m also always impressed concerning the excellent guidelines served by you. Some 2 facts in this article are undoubtedly the simplest we’ve had.
This is very interesting, You are a very skilled blogger. I have joined your feed and look forward to seeking more of your fantastic post. Also, I have shared your website in my social networks!