00:28 = What is a gene mutation? 00:56 = Substitution mutations 03:05 = Deletion mutations 04:53 = Chromosomal mutations 06:02 = Overview of meiosis/ how it differs from mitosis 08:34 = How meiosis generates variation- CROSSING OVER 10:38 = Independent segregation of homologous chromosomes 12:51 = Exam questions and mark schemes
@arjunlayall8503
5 ай бұрын
even 3 years on, you are extremely helpful and better than most teachers.
@user-bc5wy2dk2b
4 ай бұрын
ONG
@AlevelBiologyHelp
4 жыл бұрын
Something went wrong with the audio and the screen froze at the end! Sorry about that but hopefully you can still see what I put!
@zaynabyusuf5610
3 жыл бұрын
Why didn't i find u sooner?
@AlevelBiologyHelp
3 жыл бұрын
😁😁😁
@i_am_gods_child
3 жыл бұрын
thankyou so much!! i often find it easier to watch a video rather than just read pages of the textbook, so this is really helpful!
@AlevelBiologyHelp
3 жыл бұрын
Glad I could help :)
@goldielocks9092
3 жыл бұрын
I swear you've been such a big help to me.
@nikeajijola3858
3 жыл бұрын
Hey, I love your videos! But do we not need to know more detail about the stages of meiosis II?
@vane3330
3 жыл бұрын
Thank you so much! I love your channel. You always make everything so clear 😊 I’m finally understanding things.
@AlevelBiologyHelp
3 жыл бұрын
Thank you so much 💕
@andreaholland9792
3 жыл бұрын
Great video! I’ve been watching your videos for revision and they are very helpful :)
@aswinskumar3997
4 жыл бұрын
Excellent explanation , classifying it to mendelian disorders will be more excellent because the mutation of single gene comes in mendelian disorder like sickle cell anemia which is autosomal recessive disorder.
@AlevelBiologyHelp
4 жыл бұрын
You're right! Mendelian inheritance is discussed in the Inheritance chapter, which is part of the A2 content! That's why I didn't cover it👩🔬.
@aswinskumar3997
4 жыл бұрын
@@AlevelBiologyHelp cool 😄 I understand
@AmilRegi
2 ай бұрын
love your video really helpful thankyou
@keb7686
3 жыл бұрын
Deserve more subs and views
@courtneyxo631
3 жыл бұрын
my teacher taught us about missense, silent, nonsense and insertion mutations as well as the ones u mentioned in the video I was just wondering is it essential I know about it bcs its not on the mark scheme. so I'm just wondering in doing AS
@AlevelBiologyHelp
3 жыл бұрын
Hi! For AS, you only need to know about substitution and deletion (also chromosomal mutations). For A2, you need to know about addition, deletion, substitution, inversion, duplication and translocation of bases :)
@courtneyxo631
3 жыл бұрын
@@AlevelBiologyHelp ohhh thank uu
@Lavin.
7 ай бұрын
@@AlevelBiologyHelp is there a video for that?
@AlevelBiologyHelp
7 ай бұрын
Yes :)@@Lavin.
@Lavin.
7 ай бұрын
@@AlevelBiologyHelp whats it called please?
@Beautifulday1231r
2 ай бұрын
Do we not need to know further detail how trisomy or polyploidy occurs
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