I wish I could have watched all these videos when I was a Biology major. I bet my GPA would be a 3.4 instead of a 2.9. Your conviction and clarification of these topics are impressive sir!
@osamab.l.42849 жыл бұрын
wooooow this guy is crazy clever he also does chem
@sinanouraei73356 жыл бұрын
small part of lecture is wrong, two sister chromatids are exactly same and this is why we consider each centeromere as one chromosome even when it is on the one chromatid strain. In fact, pair chromosomes are 2 different chromosomes (each one has one centromere) that come from two parents.
@hindmrf56305 жыл бұрын
yes I agree even when he talks about haploid and diploid they have both 2n = 4 and it's wrong ! the diploid cell must have 4 chromosomes while the haploid cell has just 2 chromosomes
@aqk59644 жыл бұрын
Actually a diploid cell has 2pairs of each chromosome and a haploid contains only one of the of each chromosomes
@Dron0084 жыл бұрын
Thank you. That perplexed me as I got another information from different sources.
@rizwanhafeez85214 жыл бұрын
Some portion of lecture is wrong.
@Hugihugo3 жыл бұрын
7:03 might help as a time stamp, as this is the first time he goes wrong, as far as I can tell. When he points to the left part of the chromosome, that would rather be sister chromatid number 1. When he points to the right half of the chromosome, that is sister chromatid number 2. Both chromatids are identical copies of one another (made during mitosis for instance). These two halves are not however from two different parents.
@ayeshaajaz15709 ай бұрын
YOU'RE THE G.O.A.T AND THE REASON I UNDERSTAND ANYTHING IN BIO THANK YOU!!!
@kaydinfischat524 жыл бұрын
Obsessed with his accent
@ezekielkelechi7724Ай бұрын
This guy is a great teacher
@MichaelFromMiami8 жыл бұрын
Great explanation of the relationship between DNA, Chromatin, and Chromosomes.. I did not realize they were all the same thing - - just different coil levels...
@tyronebigsby2169 Жыл бұрын
Hell yeah man. You're almost single-handedly getting me through my bio/nursing majors.
@justintafoya92198 жыл бұрын
I'm so glad I stumbled upon these videos... Thanks!
@learnwithhafizaarsala55193 жыл бұрын
The way he delivered his lectures are amazing..save my biochemistry exams
@s.x.66564 жыл бұрын
DNA doesn't wrap around one histone , it wrap around octamer , isn't it ? Thank you for this helpfull lecture .
@ahmedadil72753 жыл бұрын
Yes you're right
@studilicious88445 жыл бұрын
way better than my genetics professor. thank you so much! youre amazing.
@angadmahanta88076 жыл бұрын
best teacher i have ever seen
@sciencenerd76393 жыл бұрын
Unfortunately some aspects of this lecture are wrong. This channel is still my favorite overall for studying science. Every educational channel I have looked at has an error once in awhile, nobody's perfect.
@turtle-mew2 ай бұрын
one of my top 2 favorite bio teachers
@nidhishgautam90439 жыл бұрын
For me KZbin is ak lecture. Lots and lots of wishes for you Andy. :)
@coria.19458 жыл бұрын
You are so amazing! Thank you for this, keep doing what you do!!
@2992MG7 жыл бұрын
Best online Lectures on youtube in my opinion! Keep it up!
@juancamacha85057 жыл бұрын
I'm so happy for this lectures, thank you sooo much!!!
@ayeshamalik85957 жыл бұрын
Loving the videos so far , Thank you ! :)
@mimangsachhetri44544 жыл бұрын
Sir you're the best teacher, a true science pedagogy. You're lectures are short yet very well explained Respect & love from India🇮🇳🇮🇳
@AKLECTURES9 жыл бұрын
@ nidhish gautam.. thanks! but please.. I hate the name andy ... ;-)
@raefcon98168 жыл бұрын
+AK LECTURES (Andrey K) Why hate the name Andy? Is adorable...
@AKLECTURES8 жыл бұрын
It was a joke :)
@AkashRaj-dw4ex8 жыл бұрын
+AK LECTURES (Andrey K) sir did u look at the figure and call the sister chromatids as homologous chromosomes ??
@LogarAcc8 жыл бұрын
I noticed the same mistake...
@hamzimalik5178 жыл бұрын
there is no any difference between sister chromatids and homologus chromosomes
@jezrhyldave65208 жыл бұрын
Your Videos Really Helps Me A Lot Thank You
@maiefertil7 жыл бұрын
i love ypur manner!! of explain biology!!!
@ijazgul62597 жыл бұрын
can you differentiate homologous chromosome and sister chromatid.i think you are calling chromatid as homologous chromosome.may be I m wrong please clear my confusion.otherwise it was really helpfull and I m your big fan.
@venuspalting47527 жыл бұрын
thanks for sharing us your knowledge... i learned a lots from your videos
@charumoorthi1896 жыл бұрын
Could you please clear up the sister chromatid, chromosome thing? Feel like you got it wrong in the video and have confused a lot of people including me.
@faizan34116 жыл бұрын
Exactly
@johnniewalker2306 жыл бұрын
During cell division, a chromosome basically replicates its information thus creating two sister chromatids that are conjoined by a centromere. When it comes to chromosomes, in a homologous pair, one comes from the mother while the other one - from the father.
@Dron0084 жыл бұрын
Yes. It's a pity they didn't corrent it. I started this course and now I am not sure whether to trust it or not.
@fandreacci9 жыл бұрын
Hello, thanks for your great lectures! At 6:40 you said that one chromosome comes from the mother while the other comes from the father. However it looks like that the representation of the chromosome in the board is a single duplicate chromose with two sister chromatides. Am I right? Is it possibile, naturally, two homologus chromosomes (one from the father and other from the mother) joined by a centromere? Thanks.
@herseeys7 жыл бұрын
you saved my semester
@vamshipillarishetti6 жыл бұрын
Excellent Explanation. Thank you!!
@mr.debbarma384 жыл бұрын
Sir you amazing... I'm from Tripura (India)
@shroukabdelreheem80126 жыл бұрын
Wow amazing .every time I got confused about any thing in bio chemistry just listen to ur videos that confustion absolutely goes away .may god bless u &award u PROF 😍😍😍
@mohamedabdallah4505 Жыл бұрын
you are very beautiful 😁
@blindsurgeonc9 жыл бұрын
Awesome ... learned so much!
@soumyalaha38246 жыл бұрын
Sir, I think that the DNA molecule is not wrapped around individual histones(H-2A, H-2B, H-3 and H-4) in a nucleosome. But instead it is wrapped around the core which is made of the above histones.
@bencaputo66252 жыл бұрын
Just watched this video and that chromosome your showing on the left is a single chromosome after replicating it's DNA. Those are sister chromatids connected at the centromere, not two separate chromosomes. Also, the two cells on the right your showing as haploid and diploid have the same number of chromosomes, the only difference is that the cell on the left has replicated it's DNA, thus has completed S phase of the cell cycle, and the cell on the right has not yet replicated it's DNA, thus has not yet entered S phase of the cell cycle. So in the case above both cells on the right have the same number of chromosomes.
@vinurinethma37876 жыл бұрын
These lectures are really useful ....thank u..
@ishandave35428 жыл бұрын
i have my biology finals today doing a complete marathon or your videos #mylastdaywithbiology.
@ishandave35428 жыл бұрын
btw this makes me sad.
@lubnasaqer93009 жыл бұрын
Ur lectures are amazing... I am confused though now. Whenever its in x shape, it should be 2 sister chromatids, meaning its an exact copy ,, meaning its already passed the S stage where each chromatide is copied and then paired using a centromere? Is it!!
@lubnasaqer93008 жыл бұрын
+Mo Faraz yes... thanx Mo
@zekky10008 жыл бұрын
you are of great help for my medicine admission test, some things about miosis just were very hard to understand
@047-lakshaybhugra36 жыл бұрын
amazing videos. thanks a lot sir -love from india
@thingstoknow36456 жыл бұрын
Brilliant!, I’ve subscribed
@vandanasingh50227 жыл бұрын
in love with your lectures
@user-il9hm2nv8i3 жыл бұрын
Very very very well explained thank you sir
@user-jz9uc1oh7u4 жыл бұрын
Thank you about these information
@eyadbazmawi80056 жыл бұрын
Andrey the drawings of diploid and haploid cells are wrong. Thank you
@user-vn3ss9ce5f4 жыл бұрын
If I keep thanking God until tomorrow because I found you, it will not be enough ... I prefer not to praise anyone until I make sure that he really deserves it but you always prove yourself worthily, I do not know whether you have a mind in your head or an encyclopedia because I always search for different topics and watch a lot of videos but Surprised that you have explained it too, and in fact, almost these videos Consider as a waste of time in front of your videos,…I am not sure what is the reason that does not make you much more famous!
@aribaral14859 ай бұрын
you're the goat
@samuelmuma24868 жыл бұрын
This videos are helpful. Thanks
@AKLECTURES8 жыл бұрын
+samuel muma you're welcome!
@mercyburstthebubble57634 жыл бұрын
Thank so for your time.
@mercyburstthebubble57634 жыл бұрын
Thanks so much for your time.
@joshaa9361 Жыл бұрын
Professor Andrey please could you show me where the genes fit into the picture?
@junczhang8 жыл бұрын
very clear explanation
@ALMLSAN3 жыл бұрын
You're amazing.
@user-pr1st5rh9r2 жыл бұрын
Sir,i trust your videos so whenever you make a mistake try to make it right by commenting or explaining the correction in the description.
@siera36254 жыл бұрын
Thanks
@damerihaanas45136 жыл бұрын
amazing explanation
@MedStudy1015 жыл бұрын
Sir your lecture are very helpful
@alejandrocanas67446 жыл бұрын
the GOAT of MCAT prep does it again! haha
@okaka_ryАй бұрын
Oh my God, I am studying this now in school and I would like to travel to Mars or hope that a meteorite will fall to Earth.
@MedEasyAnas4 жыл бұрын
While your videos are 99.9% awesome and I can never acquire as mich knowledge as you, I believe that you've made a mistake with regards to what a homologous chromosome means and what a diploid and haploid chromosome mean.
@d7mii_amoudi9575 жыл бұрын
You’re wrong about histones ... The dna coil around 8 histones not each histone
@shankarvirat4 жыл бұрын
You have cleared my doubt tqqq sir
@ayushraj57828 жыл бұрын
such an amazing lecture sir!!!
@ehteshamulislam46406 жыл бұрын
I had one question, the two chromosomes joined together through the centromere is called homologous chromosomes in this lecture; but in the next lecture (Cell cycle and interphase), you called them sister chromatids. which one is correct? Im very confused, I need answer please....
@binterabnawaz94212 жыл бұрын
No, 2 chromosomes joined together through centromere are not homologous but are sister chromatids
@TourniquetTwin6 ай бұрын
Yet again, Andrey to the rescue.
@clinicalpharmacy38 жыл бұрын
you are incredible really thank u u r awsome
@laf48912 жыл бұрын
Question about maternal and paternal chromosomes - in the diagram of the chromosome you pointed out that one was from the maternal and the other from the paternal. I thought that there was two homologous pairs and that the diagram you presented is one of them. I understood that the chromosomes are as you displayed on the whiteboard during replication and the the two parts are the sister chromatids. Could you please explain for me or maybe link me to a video that explains. I am learning about this for my job. Thank you so very much. LA
@dat_boiii6272 жыл бұрын
Sister chromatids are not from different parents..its the 2 chromosomes of the homologous pair that are from different parents and have different genes
@sahidasultana83096 жыл бұрын
Very nice.👌👏👍..thanks sir. ☺☺☺ ...
@ahmadmola95745 жыл бұрын
I think there is an error in your lecture, centromer binds two chromatid which both of them identical not mix from father and mother
@angelicaclaus Жыл бұрын
How do you can explain all the subjects of so many areas? congrats
@nadine-mu3rj8 жыл бұрын
In a homologous pair of chromosomes, one comes from the mom and the other from the dad. So is each chromosome in the pair made of a different DNA molecule (one from the mom and one from the dad)? Might be a dumb question but I am trying to self-learn genetics as I haven't taken the course yet :/
@sahildhar75378 жыл бұрын
yes
@vandanasingh50227 жыл бұрын
n loads of good wishes for you from india
@whatocaho26 жыл бұрын
Why do we need protein to wrap around the double helix DNA molecule and to form centromere?
@mack_raymond7 жыл бұрын
Thank you
@purnimaorea30028 жыл бұрын
very good explanation (y)
@faizan34116 жыл бұрын
I think that chromosomes are counted by number of centromeres. So here we have one chromosome with two chromatids. But you are equating one chromatid with one chromosome. I need clarification
@jijibend17 жыл бұрын
i m confused here you said single chromosome is two chromatids each from different parent. isn t the homologous chromosomes that are each from each parent and that a single chromosome is duplicated chromatid from the same parent.?
@johnniewalker2306 жыл бұрын
Yes, you are correct. In each pair of homologous chromosomes, one comes from the mother and the other one - from the father. Chromatids are just a copy of each chromosome that is created and used during cell division.
@ClaZanIng6 жыл бұрын
Thank you for your great job, I really do appreciate your channel. But I must give reason to some people below: "small part of lecture is wrong, two sister chromatids are exactly same..." @Sina Nouraei Further more the two sister chromatids of one prophase chromosome are the product of the semiconservative Replikation of one DNA Molecule which occurs during the S-Phase of the cell cycle. Do you agree with me? Have you ever consider to change the picture behind you? The "haploid" cell on the right isn't the haploid counterpart of the cell on the left. This cell is diploid - if we consider the two cells of the same exemplary organism - The cell on the right seams much more to be one of the daughter cells of the cell on the left after mitosis. or?
@Netherlag17 жыл бұрын
why does he call one chromatid of a chromosome an individual chromosome?
@faizan34116 жыл бұрын
I think he is wrong here
@BioAffairs6 жыл бұрын
#abmebiosciences Chromosome consist of two chromatids
@johnniewalker2306 жыл бұрын
But only during division, right?
@SoniaSoma6 жыл бұрын
What playlist is that part of? Thank you
@paperinashes Жыл бұрын
Do you have a video on polytene chromosomes? :)
@splendorchannel33997 жыл бұрын
has increase my dimensions continue ...
@sfynxci43584 жыл бұрын
Why does the chromosome condense during meiosis?
@ujjwalmishra80367 жыл бұрын
grand salute fr dis😘😘
@IUS-gaming3 жыл бұрын
Nice
@isiherrera54086 жыл бұрын
Homologous chromosomes≠sister chromatids
@michelandre8106 Жыл бұрын
Warning...this lecture has to be corrected!!
@anjanikumar87924 жыл бұрын
Please provide pdf too
@sakama407 жыл бұрын
thanx
@Wild.Arr0w6 жыл бұрын
I got a question so 1 chromosome contains 2 different DNA molecule ?
@nashoba49242 жыл бұрын
:eerrrr.... problem (7'10'') a chromosome is all the "X form", not only the half ! The half is a chromatid and the other is a copy of it (the exact copy of the other except in some cases like the crossing over...). One chromosome of the pair is inherited from the father and the other (the over X composed also of two chromatids) is inherited from the mother. Warning.
@shamaparvin40544 жыл бұрын
It's quite Confusing My Knowledge ...sister Chromatids r from 2 different parents ? ?
@bread278 жыл бұрын
Where do Chromatids fit in? Could anyone help me?
@mukeshmaurya44159 жыл бұрын
Please tell me about the reference of this vidio
@steven_king Жыл бұрын
Aren’t you calling a “chromatid” a chromosome?
@aaronrose60569 жыл бұрын
I love biology but I ain't in biology class stuck in physical science its alright but I love DNA and RNA it's fascinating. Now i am planning on a expirement but i only know one. But i want to know another expirement to preform.
@madaalsadi97997 жыл бұрын
you remind me of sheldon copper somehow
@user-xo2of8ho1p9 ай бұрын
if ii hear basically one more time
@jasminethorson6728 жыл бұрын
Marry me
@AKLECTURES8 жыл бұрын
+Jasmine Thorson :-)
@harrysingh58177 жыл бұрын
Lmao, This is AK's way of saying no politely... Trust me im from NY as well :)... haha