omg I knew Ive heard your voice before! my school took away our edrolo biology subscriptions and it was a real pain not being able to watch the videos anymore, but somehow I stumbled across your RUclips channel looking for videos on genetics and im so happy that I found ur videos. they are incredibly helpful and easy to understand and when the person explaining the concept is actually interested about, its a lot easier to learn. thank you a tonne for this videos they r a lifesaver 😁
Fun, not arrogant, clear examples, bridging scientific concepts with relatable scenarios, and to top things off you are nice. Mr. Douch, you are what I wish all professors were like. Thank you sir.
At 10:20, you say that the crossing over occurs at "metaphase I" but all the textbooks I've seen say that the crossing over occurs in prophase I. Thank you so much for these videos. Your choice of examples and explanations are very clear.
You're actually amazing you helped me address/get over all of my confusion regarding all of this. Everything honestly makes perfect sense bc of this video! Thank you so much!!
You, Sir are a legend. I have spent hours reading my textbook, lab manual and other videos to get all this straight in my head. You have managed to help me get everything straight in my head in just under 15 minutes. Thank you so much!
This explanation went so far. It make me understand a concept i have been struggling to understand for a long time. I really appreciate it Andrew, you've made a huge difference in my career.
Thank you so much! you've pretty much just explained a whole week of confusing class work in 15 minutes! (maybe its cause i wasnt paying attention to the teacher) but any ways, you are a life saver!
Thank you for this video! I have been struggling with this topic for a long time now. Somehow these concepts are so abstract to me, but this truly helped me see through some of the different possibilities in our genetical world.
Thank you so much! Helped out a lot 👍 It solved all the confusion I had about the laws of segregation and independent assortment for linked and unlinked genes! Keep it up 👏👏
andrew, thanks allot, your videos are very helpfull you explain everything clearly with good examples, i have a test thursday and i'm not afraid anymore:)
If it were the other way round then the majority of offspring would have the combination of traits that are determined by those alleles. There will always be four combinations of phenotypes. Two of those (the parental) ones will be the most common. The other two are recombinant.
that's pretty much right. yes. if you were only interested in ascertaining genotypes - there is no need to do it as a dihybrid cross. (for all intents and purposes, anyway) :)
this was such a great explanation. thanks so much! just wondering..what if the linked genes were Cg and cG? the results would be different, but how do you know whether it is linked CG and cg or Cg and cG?
That would not be dihybrid test cross. You could still predict the outcome of the cross using a punnet square, but you would not be looking at the ratio of parental and recombinant offspring to make any kind of assessment of whether the genes are linked or not because you'd have only two different phenotypes in the offspring.
Hi again. If it was CCGg x ccgg, and linked, how would you get the parental phenotypes, if you can't have cc in the offspring? (Does linked always mean more parental?)
So does that mean that you would only use a dihybrid test cross to tell you if and how genes are linked, but not to tell you the actual genotypes (as you would in a monohybrid test cross)? Thanks a lot for your answers!
Hi Andrew. What software are you using for this screencast? I'm just starting on the journey of screencasting for my kids at school, and I love the software you're using. Thanks.
Awesome, this is what I been looking for. Showing meiosis and how the chromosomes are moving in relation to these crosses. No one else had done it. So this is meiosis I being shown in the Punnett square?
Is it a fact that C and G are on the same chromosome and c and g are on the same chromosome? To have the results in 10:14 be equal to the parents’ would mean that it is but double checking to be sure.
I have my oral exam in biology on tuesday, and this was one the things that truly did not make sense to me. But this video helped a lot, so thank you! btw, I cannot get over the fact that I´m learning this in grade 11, in highschool.. GOD oral exams are the worst!!
no its a dihybrid cross when it involves two genes. It's a test cross when one of the individuals is heterozygous and the other is homozygous recessive. In your example, one was homozygous recessive. The other one was only heterozygous at one gene loci ... so it's a dihybrid cross, but not a dihybrid TEST cross.
No you would not fill them out for the linked genes, because that will not give you an accurate representation of what will actually happen when these genes are linked, because they will not always cross over and recombine, the more map units apart these linked genes are, the more likely they will be to cross over and recombine and the higher percent frequency of recombinant phenotypes will result, however this cannot really be represented on a simple punnett square
The recessive genotype on the left would be the same for each row so when you filled it in it would be the exact same as the first row. So the proportions would not change and it just saves time, plus it makes it not so complex/ cluttered.
I love how excited you get when teaching! It's refreshing.
I have never felt more positive vibes from a person lol
This gave me a practical insight like it was more practical than theoretical
omg I knew Ive heard your voice before! my school took away our edrolo biology subscriptions and it was a real pain not being able to watch the videos anymore, but somehow I stumbled across your RUclips channel looking for videos on genetics and im so happy that I found ur videos. they are incredibly helpful and easy to understand and when the person explaining the concept is actually interested about, its a lot easier to learn. thank you a tonne for this videos they r a lifesaver 😁
Fun, not arrogant, clear examples, bridging scientific concepts with relatable scenarios, and to top things off you are nice. Mr. Douch, you are what I wish all professors were like. Thank you sir.
This is amazing! He explained it so well, i've been battling with my textbook for hours now.
The world needs more teachers like you brother! Thanks
At 10:20, you say that the crossing over occurs at "metaphase I" but all the textbooks I've seen say that the crossing over occurs in prophase I. Thank you so much for these videos. Your choice of examples and explanations are very clear.
crossing over does happen at prophase I
By far, one of the best teachers.
You must truly love biology
yea so enthusiastic
real spicy about it
Just taught me more than i learned all year in my whole college bio class, this will surely be of aid to me on final next week
i love how you seem so genuinely amused about the topic LOL. thanks for the videos! really helped me a lot! :D
I was stuck since half an hour linking dihybrid cross with meiosis.Thank you much for clearing the doubts.
This is the best video ever, the visualizations made everything click. Big help for the ap exam this year
You're actually amazing you helped me address/get over all of my confusion regarding all of this. Everything honestly makes perfect sense bc of this video! Thank you so much!!
You, Sir are a legend. I have spent hours reading my textbook, lab manual and other videos to get all this straight in my head. You have managed to help me get everything straight in my head in just under 15 minutes. Thank you so much!
legend says you're still reading the textbook
@MrLsu2000 You are welcome - thanks for the feedback :)
This explanation went so far. It make me understand a concept i have been struggling to understand for a long time. I really appreciate it Andrew, you've made a huge difference in my career.
Thank you so much! you've pretty much just explained a whole week of confusing class work in 15 minutes! (maybe its cause i wasnt paying attention to the teacher) but any ways, you are a life saver!
I like watching you. You make the whole experience enjoyable and thoroughly explain what is going on. So thank you!
This is exactly what i've been trying to figure out for so long!
please create a podcast for mindfulness and meditation your voice is so soothing
You really helped me out with my exams, you're awesome 💜
This video really helped me clear up a lot of confusion, as this topic can get pretty tricky. Thank you so much!
Thank you for this video! I have been struggling with this topic for a long time now. Somehow these concepts are so abstract to me, but this truly helped me see through some of the different possibilities in our genetical world.
So helpful , mainly because of your enthusiasm! after a few times watching this i might be ok for my a level! Thanks
Thank you very much!!
I have an important test and you've helped loads! i understand dihybrid crosses so much better now :D thank you! keep it up :D
Thank you so much! You explained in 14 minutes what I was trying to figure for hours!
You're a lifesaver!! thank you for also being so enthusiastic about biology
The best video on linked genes! Thank you!
thanks bossman, had to teach my self because my professor isn't as clear as you. appreciated.
Thank you so much! Helped out a lot 👍 It solved all the confusion I had about the laws of segregation and independent assortment for linked and unlinked genes! Keep it up 👏👏
andrew, thanks allot, your videos are very helpfull you explain everything clearly with good examples, i have a test thursday and i'm not afraid anymore:)
thank you andrew douch for this video and explanation you are the absolute goat
Have a Biology midterm tomorrow. You're a lifesaver!
How did it go?
@@briang1310 lol
@@uzi6839 hey, what’s up.
You make genetics sound exciting....enjoyed this video!
I was so confuse with this topic and now i am pretty familar with this topic. Thank you so much.. you are a great teacher
THANK YOU SO MUCH. This video was really useful and informative! I like your teaching style and personality, too!
This is the best explanation ever! So confused before. Thank you!
omg just found out that you have your own channel, feel blessed
So much better than my lecturer!! Thankyou very much!!
Glad it helped!
This is probably as good as it gets in terms of explaining this concept.
seems like u really like biology. you teach with a lot of passion !
If it were the other way round then the majority of offspring would have the combination of traits that are determined by those alleles. There will always be four combinations of phenotypes. Two of those (the parental) ones will be the most common. The other two are recombinant.
that's pretty much right. yes. if you were only interested in ascertaining genotypes - there is no need to do it as a dihybrid cross. (for all intents and purposes, anyway) :)
impressive explanation capability. Thank you!
This is a pretty good introduction to recombinant* (12:15) DNA Mr. Douch.
just at 2:14 - the second mouse is always going to be homozygous recessive and never dominant ?? :-)
this was such a great explanation. thanks so much!
just wondering..what if the linked genes were Cg and cG? the results would be different, but how do you know whether it is linked CG and cg or Cg and cG?
that's the same question i have
This is so helpful, thanks Douchy
outstanding explanation, and enthusiasm
doesn't crossing-over occur during prophase I?
Btw, this was really helpful! :)
SIR YOU ARE A HERO.
why were you chuckling when you were talking about that CSP mouse? God you sounded sadistic. But all in all, this is awesome! Thanks!
Hey just wondering wht the significance of the p-chrmosomes were on the second part of the video that had to do with CG alleles.
This was such amazing help. Thank you so much for explaining this!
That would not be dihybrid test cross. You could still predict the outcome of the cross using a punnet square, but you would not be looking at the ratio of parental and recombinant offspring to make any kind of assessment of whether the genes are linked or not because you'd have only two different phenotypes in the offspring.
Hi again. If it was CCGg x ccgg, and linked, how would you get the parental phenotypes, if you can't have cc in the offspring?
(Does linked always mean more parental?)
What a brilliant video! Thanks mate!
So does that mean that you would only use a dihybrid test cross to tell you if and how genes are linked, but not to tell you the actual genotypes (as you would in a monohybrid test cross)?
Thanks a lot for your answers!
When the parentals are recombinations, does that mean their parents are homozygous recessive and heterozygous WT?
Have a quiz on Biology tomorrow! And my finals next week! Thank you :)
How did it go?
@@briang1310 Replies 5 years later lol
Hi Andrew. What software are you using for this screencast? I'm just starting on the journey of screencasting for my kids at school, and I love the software you're using. Thanks.
Thanks for your videos!
Do the terms recombinant/parental go on the phenotype or the genotype? Or both?
thank u so much for gr8 explanations...it really helps me a lot..
Thank you for explaining this so well!
how do we know which genes r linked together??? how come it's CG and cg, how about Cg and cG?
holy s*** the penny dropped thank you so much!
Awesome, this is what I been looking for. Showing meiosis and how the chromosomes are moving in relation to these crosses. No one else had done it. So this is meiosis I being shown in the Punnett square?
Amazing video. 🤩
Glad you liked it!
So a dihybrid cross is only when it is heterozygous?
Is it a fact that C and G are on the same chromosome and c and g are on the same chromosome? To have the results in 10:14 be equal to the parents’ would mean that it is but double checking to be sure.
you're amazing! keep teaching
You are the best! THANK YOU!
awesome!! you explain it much better than my teacher :) thank you very much
your video is truly helpful, thx so much!
so glad I found this !
Thank you! Really helpful and well explained.
I have my oral exam in biology on tuesday, and this was one the things that truly did not make sense to me. But this video helped a lot, so thank you! btw, I cannot get over the fact that I´m learning this in grade 11, in highschool.. GOD oral exams are the worst!!
I'm in 9th grade and learning this and it's horribleeee
great explanation. i love the enthusiasm :D
Love the excitment !
i think u just saved my grade
THANKS Douchy!
So helpful, thanks a million sir!
no its a dihybrid cross when it involves two genes. It's a test cross when one of the individuals is heterozygous and the other is homozygous recessive. In your example, one was homozygous recessive. The other one was only heterozygous at one gene loci ... so it's a dihybrid cross, but not a dihybrid TEST cross.
BEAUTIFUL!
that's very helpful. thank you so much.
Thank you so much, this was really amazing!!!
wonderful explanation. thank you!!!
SO useful, thank you!!!
Excellent!
really good video..i learnt a lot..thank you sir :)
you sir, are a god!
You are amazing thank you!
Ecellent video.
Great job!!!
Thank you, Sir!
Bro u save my life for the test today how can i repay you?
Well what goes in the bottom boxes? He never finished it. I assume you just fill them in as you normally one in a chart, but I'm not sure.
No you would not fill them out for the linked genes, because that will not give you an accurate representation of what will actually happen when these genes are linked, because they will not always cross over and recombine, the more map units apart these linked genes are, the more likely they will be to cross over and recombine and the higher percent frequency of recombinant phenotypes will result, however this cannot really be represented on a simple punnett square
The recessive genotype on the left would be the same for each row so when you filled it in it would be the exact same as the first row. So the proportions would not change and it just saves time, plus it makes it not so complex/ cluttered.
Thank you!