Evolucija je eden najpomembnejših konceptov v biologiji, ki razlaga, kako... Show more
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Updated Apr 21, 2026
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Osnove evolucije: kako deluje in zakaj je pomembna
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Kaj je evolucija?
Predstavljaj si, da bi lahko videl, kako se živa bitja spreminjajo skozi milijone let - od majhnih bakterij do ogromnih kitov. Evolucija je prav to: postopno spreminjanje dednih lastnosti v populacijah organizmov skozi generacije.
Ključno je razumeti, da se ne spreminjajo posamezniki, ampak populacije. Ti se ne moreš evolucijsko prilagoditi med svojim življenjem, lahko pa se prilagodi tvoja vrsta skozi generacije.
Naravni izbor je glavni motor evolucije. Deluje preprosto: tisti osebki, ki so bolje prilagojeni na svoje okolje, imajo večje možnosti preživetja in več potomcev. Njihove ugodne lastnosti se tako širijo po populaciji.
Pomembno: Evolucija nima cilja! Ne vodi k "popolnosti", ampak le k boljši prilagoditvi na trenutne razmere v okolju.
Kako deluje naravni izbor?
Naravni izbor deluje v petih preprostih korakih, ki se nenehno ponavljajo. Najprej imamo variabilnost - v vsaki populaciji so osebki različni (nekateri zajci so hitrejši, drugi počasnejši).
Te različne lastnosti so dedne - prenašajo se preko genov s staršev na potomce. Ker pa se rodi več potomcev, kot jih lahko preživi, pride do boja za obstanek. Hrana, prostor in partnerji so omejeni.
Tukaj pride do ključnega koraka: osebki z ugodnimi lastnostmi lažje preživijo in imajo več potomcev. Hiter zajec bo pobegnil lisici, počasen pa ne. Skozi čas se bo v populaciji nabralo vse več hitrih zajcev - populacija evolvira.
Primer: Če bi danes vsi jemali antibiotike nepravilno, bi preživele le odporne bakterije. V nekaj generacijah bi nastala populacija, ki bi bila popolnoma odporna.
Dokazi za evolucijo
Evolucijo podpirajo dokazi iz različnih področij znanosti. Fosili so kot fotografije iz preteklosti - kažejo nam, kako so se vrste spreminjale skozi milijone let. Najdemo lahko tudi prehodne oblike, ki povezujejo različne skupine.
Primerjalna anatomija primerja zgradbo organizmov. Homologni organi imajo enak osnovni načrt (roka človeka, plavut kita, krilo netopirja), kar dokazuje skupnega prednika. Analogni organi pa opravljajo podobno funkcijo, vendar so se razvili neodvisno (krilo ptiča in žuželke).
Embriologija kaže, da so si zarodki različnih vretenčarjev v zgodnjih fazah zelo podobni. Molekularna biologia pa primerja DNA - bolj kot sta si vrsti sorodni, podobnejša je njuna genetska koda.
Zanimivost: Tvoja DNA je 98,8% enaka DNA šimpanza in kar 60% enaka DNA banane! To kaže na skupen izvor vseh živih bitij.
Primeri iz resničnega življenja
Brezov pedic je postal slovit primer naravnega izbora v akciji. Pred industrijsko revolucijo so bili svetli metulji dobro skriti na svetlih deblih brez. Ko so debla zaradi saj postala temna, so imeli prednost temni metulji.
Ptice so lažje opazile svetle metullje, zato so imeli temni boljše možnosti preživetja. V nekaj desetletjih se je delež temnih metuljev v populaciji močno povečal. Ko se je onesnaženje zmanjšalo, se je proces obrnil.
Odpornost bakterij na antibiotike je sodoben primer evolucije. V populaciji bakterij je zaradi mutacij vedno nekaj odpornih osebkov. Ko vzamemo antibiotik, pobije večino občutljivih bakterij, preživijo pa odporne. Te se nato hitro razmnožijo.
Nasvet: Zato je ključno, da antibitoke jemlješ točno po navodilih zdravnika in do konca - sicer "treniraš" bakterije, da postanejo odporne!
Ključni poudarki za izpit
Za uspešno opravljanje izpita si zapomni te ključne točke. Evolucija je spreminjanje dednih lastnosti populacij skozi generacije, glavni mehanizem pa je naravni izbor.
Pogoji za naravni izbor so: variabilnost v populaciji, dednost lastnosti, boj za obstanek in različno preživetje glede na lastnosti. Rezultat so prilagoditve na okolje.
Glavni dokazi vključujejo fosile, homologne in analogne organe, embriologijo ter primerjavo DNA. Ne pozabi na primera brezovega pedica in odpornosti bakterij - odlična sta za razlago na izpitu.
Opomnik: Posameznik se ne more evolucijsko prilagoditi med življenjem. Evolucija se dogaja na ravni populacij skozi generacije!
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Where can I download the Knowunity app?
You can download the app from Google Play Store and Apple App Store.
Is Knowunity really free of charge?
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4.6/5
App Store
4.7/5
Google Play
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user
Osnove evolucije: kako deluje in zakaj je pomembna
Evolucija je eden najpomembnejših konceptov v biologiji, ki razlaga, kako so nastala vsa živa bitja na Zemlji. Gre za proces, ki se dogaja pred našimi očmi - od odpornosti bakterij na antibiotike do sprememb pri živalih zaradi podnebnih sprememb.
Kaj je evolucija?
Predstavljaj si, da bi lahko videl, kako se živa bitja spreminjajo skozi milijone let - od majhnih bakterij do ogromnih kitov. Evolucija je prav to: postopno spreminjanje dednih lastnosti v populacijah organizmov skozi generacije.
Ključno je razumeti, da se ne spreminjajo posamezniki, ampak populacije. Ti se ne moreš evolucijsko prilagoditi med svojim življenjem, lahko pa se prilagodi tvoja vrsta skozi generacije.
Naravni izbor je glavni motor evolucije. Deluje preprosto: tisti osebki, ki so bolje prilagojeni na svoje okolje, imajo večje možnosti preživetja in več potomcev. Njihove ugodne lastnosti se tako širijo po populaciji.
Pomembno: Evolucija nima cilja! Ne vodi k "popolnosti", ampak le k boljši prilagoditvi na trenutne razmere v okolju.
Sign up to see the contentIt's free!
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Improve your grades
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Kako deluje naravni izbor?
Naravni izbor deluje v petih preprostih korakih, ki se nenehno ponavljajo. Najprej imamo variabilnost - v vsaki populaciji so osebki različni (nekateri zajci so hitrejši, drugi počasnejši).
Te različne lastnosti so dedne - prenašajo se preko genov s staršev na potomce. Ker pa se rodi več potomcev, kot jih lahko preživi, pride do boja za obstanek. Hrana, prostor in partnerji so omejeni.
Tukaj pride do ključnega koraka: osebki z ugodnimi lastnostmi lažje preživijo in imajo več potomcev. Hiter zajec bo pobegnil lisici, počasen pa ne. Skozi čas se bo v populaciji nabralo vse več hitrih zajcev - populacija evolvira.
Primer: Če bi danes vsi jemali antibiotike nepravilno, bi preživele le odporne bakterije. V nekaj generacijah bi nastala populacija, ki bi bila popolnoma odporna.
Sign up to see the contentIt's free!
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Improve your grades
Join milions of students
Dokazi za evolucijo
Evolucijo podpirajo dokazi iz različnih področij znanosti. Fosili so kot fotografije iz preteklosti - kažejo nam, kako so se vrste spreminjale skozi milijone let. Najdemo lahko tudi prehodne oblike, ki povezujejo različne skupine.
Primerjalna anatomija primerja zgradbo organizmov. Homologni organi imajo enak osnovni načrt (roka človeka, plavut kita, krilo netopirja), kar dokazuje skupnega prednika. Analogni organi pa opravljajo podobno funkcijo, vendar so se razvili neodvisno (krilo ptiča in žuželke).
Embriologija kaže, da so si zarodki različnih vretenčarjev v zgodnjih fazah zelo podobni. Molekularna biologia pa primerja DNA - bolj kot sta si vrsti sorodni, podobnejša je njuna genetska koda.
Zanimivost: Tvoja DNA je 98,8% enaka DNA šimpanza in kar 60% enaka DNA banane! To kaže na skupen izvor vseh živih bitij.
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Primeri iz resničnega življenja
Brezov pedic je postal slovit primer naravnega izbora v akciji. Pred industrijsko revolucijo so bili svetli metulji dobro skriti na svetlih deblih brez. Ko so debla zaradi saj postala temna, so imeli prednost temni metulji.
Ptice so lažje opazile svetle metullje, zato so imeli temni boljše možnosti preživetja. V nekaj desetletjih se je delež temnih metuljev v populaciji močno povečal. Ko se je onesnaženje zmanjšalo, se je proces obrnil.
Odpornost bakterij na antibiotike je sodoben primer evolucije. V populaciji bakterij je zaradi mutacij vedno nekaj odpornih osebkov. Ko vzamemo antibiotik, pobije večino občutljivih bakterij, preživijo pa odporne. Te se nato hitro razmnožijo.
Nasvet: Zato je ključno, da antibitoke jemlješ točno po navodilih zdravnika in do konca - sicer "treniraš" bakterije, da postanejo odporne!
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Ključni poudarki za izpit
Za uspešno opravljanje izpita si zapomni te ključne točke. Evolucija je spreminjanje dednih lastnosti populacij skozi generacije, glavni mehanizem pa je naravni izbor.
Pogoji za naravni izbor so: variabilnost v populaciji, dednost lastnosti, boj za obstanek in različno preživetje glede na lastnosti. Rezultat so prilagoditve na okolje.
Glavni dokazi vključujejo fosile, homologne in analogne organe, embriologijo ter primerjavo DNA. Ne pozabi na primera brezovega pedica in odpornosti bakterij - odlična sta za razlago na izpitu.
Opomnik: Posameznik se ne more evolucijsko prilagoditi med življenjem. Evolucija se dogaja na ravni populacij skozi generacije!
We thought you’d never ask...
What is the Knowunity AI companion?
Our AI Companion is a student-focused AI tool that offers more than just answers. Built on millions of Knowunity resources, it provides relevant information, personalised study plans, quizzes, and content directly in the chat, adapting to your individual learning journey.
Where can I download the Knowunity app?
You can download the app from Google Play Store and Apple App Store.
Is Knowunity really free of charge?
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
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Students love us — and so will you.
4.6/5
App Store
4.7/5
Google Play
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user