Genetic Drift - bottleneck and founder effect
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- Опубликовано: 23 июл 2024
- This lecture explains about the genetic drift and the example of genetic drift events such as the bottleneck effect and the founder effect that explains the change in the genetic frequency with time by random chance. Genetic drift describes random fluctuations in the numbers of gene variants in a population. Genetic drift takes place when the occurrence of variant forms of a gene, called alleles, increases and decreases by chance over time. These variations in the presence of alleles are measured as changes in allele frequencies.
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Even after 5 years, this is still gold!❤️
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Yes..❤️
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Sir very very thank you!! what an amazing explanation I´ve seen! Im from Mexico and no one in my school could explain this better than you did! congratulations!
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In bottle neck we lose gene pool
Eg if initially we have 100 tigers & due to some human interference or Natural disaster 90 tigers die & we r left with 10.
Now if we will breed the left 10 tigers & then make them back 100
What we lose here is Gene pool as the 90 tigers we lost may have certain Genes which may have some benefits like fighting a particular disease but here we lost them.
Great sir.
yes definitely....
😎Oo
Exactly
you are right Wani Javid, bottleneck events lower genetic variation in the population. As the population size becomes smaller due to certain events like natural calamities, the changes in allele frequency becomes highly evident with majority of individuals in the population having either more recessive or dominant alleles. In short genetic variation is very less among the individuals in that particular population. Even when the population size increases in the future also the variation in the population remains low which is highly detrimental for survival. The same is true for founder effect, it decreases the genetic variation in the population. he rightly explained that part with example of people from Africa.
wow! this is easily one of the best presentations on GD I've watched. thank you for taking the time to do this.
Thank you so much Sir! Its a blessing to have you on RUclips!
You are amazing, very clear and precise . Moreover that you expain all your lessons in English is super scientific. Thanks so much. You have no idea how valuable I have found your work. Good job!!!
I watched already 20 videos of you. You are such a passionate teacher and your explanations are so rich and clear. Greetings from Spain!
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salam..i like ur videos..i never was interested in this subject but u made it easy for me..n now regularly m taking ur lectures.. thanks alot.. stay blessed
You cleared concepts so easily and the last one why it is named drift was amazing you nailed it 🤩
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amazing explanation, sir. i had great confusion about genetic drift, but after watching this video, i understand properly. thank u very much..
You are just awesome sir! Here am after 4 years of NEET exam and you're helping me in my degree course as well. Thank you!
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How can u be this much perfect bro??U r juzz amazing!!Keep posting..
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Thank you sir for tha relevant information.actually I dont know about genetic drift.your video very helpful for us.thank you so much sirr
thank you so much sir.. i am doing Ph.D in human genetics but the concept of genetic drift was not cleared til now.. i was always confused by bottleneck and founder effect.. you made it so easy nd logical.. thanks alot.. keep helping :)
+Monika Lochan thank you for watching the lecture. Glad it helped.
Very informative and helpful
phd hoke b unped
Simply awesome Sir
and dat final graph made d idea a precise one...
Absolutely amazing sir.. 🤗
you made it so simple!thank you.
thnku sooo much sir ur all d videos r soo helpful
keep it up ..n god bless u
thnks to shomu's biology
really helped me understand it, thank you so much!
these vdos are really helpful. thank u.
sir its really amazing..i understood it vv well.thankyou..
your amazing no words to explain your teaching sir
THANKS A LOT SIR!! YOU CLEARED ALL MY DOUBTS FROM GENETIC DRIFT!!!
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Oh god, such a difficult concept was explained so well 🙌. A big thank you sir 🤩
I have a question sir. Can we have any control on selection in genetic drift?
I have a question: at minute 10:00 you say that now we have much more features in the population compared to the population we saw earlier. Why is that so?
Dada the Graf you showed is nowhere available.and nobody tolled what actually is this Genetic Drift. Thank you. You are a great Blessing to The People of India.
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Beautifully explained💎
after 1 year onces agai i am watching you i hope i will be do better after listening you. thanks
Sir you a example of genetic drift, in this you suppose the p . 5 and q. 5 after the time period p becomes 1 then if p+q=1 , then if we calculate the p and q in population it's also become equal to 1 , then why should not follow the Hardy Weinberg law
would you please make a class on genetic polymorphism and it's three basic avenues.
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Dr shomu's thanks allot for your help......aniway can u please explain me meiotic drive and migration pressure....... thanking you in anticipation. ......
Really a great one ....!
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thnks a lot.. keep going..best sir..😇
Your accent is very very strong, making hard to focus at first for a foreigner like me ; but when the focus is put on what you say, the explanation is absolutely perfect ! Thank you !
Impressive explanation!
You explained genetic drift with 2 different allele frequency, how does the same applies for seal population? Can it happen for 3 or 4 alleles?
very good and lucid explanation ..from a medical professional
No words to explain my gratitude towards you sir
Thank you
Thank you very much for this video..
Awesome explanation sir
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It's nice to hear that you are getting benefit from the videos
Sir i have I doubt
Can we say that at the time of minimum population, natural selection occurs simultaneously with genetic drift because at that time the organism selects the best environmental conditions.
Please clear my doubt
Tq so much sir...I don't understand what is genetic drift until i found your vid❤❤
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you are awesome sir ,thanks a lot
Thank you sir. Keep making a biology video
for the founder effect it is the classical example...The Afrikaner population of South Africa is mainly descended from one shipload of Dutch people ... The ship of 1652 contained a Dutch man carrying the gene for Huntington's disease,... very good reading
In case of bottleneck effect many unique combination of traits might just get wiped out because many many individuals were killed [as in this elephant seal example] thus it is essential to understand the concept of allele which is one of gene pair found on the homologous pair of chromosomes because pair of alleles carry the unique traits in individuals [refer Tt, or Rr in Mendel's experiment], all those killed individuals had unique alleles which were just wiped out from the population...
Urgent please: Could you relate this to the Tajima's D?
Thnx a lot Shomu ji
Great explanation sir
fantastic sir!!!!
how does this helps in speciation?
Tq sir really helped 2 teach it right way
Thank you so much for making this topic to understand easily and elaborately
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which materials to follow for evolution?
Thank u sooo much sir🙏
great video..............................
it was very helpful thnks sir
I really like the way you explain things...thank you sir.. Can you help to to reach your class about inbreeding depression and problems
My favourite lecturer and thanks for amazing explanation ❤️❤️
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Great explanations. Thank you!
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Sir how to write answer writing in zoology optional for upsc exm...
Allele and Alleles need clarification, and the classical example of bottleneck effect you mentioned is the population of Northern elephant seals....hunting reduced their numbers to 20 around the year 1890s
8 years later and you're still replying the comments wow
Yes i try to do my best
Thank you good sir.
Pls sir tell me why in a small population evolutionary changes influence
The allele clock does not beat metronomically. Multitudes of factors influence genetic "drift". Keeping it simple, access to water, exposure to variable weather effects plants' growth rates and cycles. As does mineral composition of soil. And eating plants and animals in different areas will cause alleles to differ. We're 99% the same, but that 1% is hugely important.
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Thanks
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Any one can share lecturer regarding wahlund principle
So.. for genetic drift.. population should be small and isolated?...no gene flow???... please help
Osadharon dada ...chalie jao ...
Thank you
Such an amazing explanation
Thankyou Sir
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Thank you sir it is very useful video for all who are studying zoology subject
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bhai bahut accha samjhaya bahut hi jyada accha ek like to banta hai mere se.... thank u soooo much bhai
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In a big population if the creatures are in big number then what will happen?
thank you so much professor!
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Very nicely presented. Thank you
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Very nicely explained. Thank you 👍
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It really helped me a lot❤️❤️❤️❤️...🙏🙏🙏🙏Guru jiiii
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Amazing explanation sir
It really helped me
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Sure. Thank you.
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