people like you on youtube make me rethink paying thousands of dollars for classes at a 4 year University. You made something I had no grasp of extremely understandable in a fraction of the time I've spent on our course textbook software and online lecture tools. Thank you so much.
This is a resource for my class at the 4-year university where I teach: Samford University, Birmingham AL. We'd be glad to have you in our Biology department. 😁
omg. i wish you were my professor. I sat in the lecture for 2 hours, but had no idea what my professor was talking about. But i got the concept less than one minute after watching your video. Thank you so much
My head was jammed before watching this. Calmed my mind and watched the whole video. Everything is clear. Now I am able to solve more problems like these. Thanks Professor.
Much appreciated! You've taught me more than my lecturer and tutor in these 32 minutes than they have in the past 4 weeks. Thumbs up!! Hope you have a wonderful day Sir :)
I have searched for more than 50 videos on this topic because I am an absolute beginner. YOUR VIDEO IS THE BEST !!! and really helped me. Thanks for such a detailed explanation. Loved it !! Thanks a lot
Sir, you are brilliant in all aspects of teaching. Your lessons have truly left a remarkable impact on my life, and with that, I hope to pass on your teachings to those around me in an effort to spread knowledge and positivity. I hope all goes well for you in life and I hope that you truly understand the significance of education that you helped spread across the internet. Thank you.
Thanks, Professor Dr. David A. Johnson, You have explained so very beautifully that I am in awe of understanding this concept which eluded me throughout the week. May God bless you and keep you safe in these trying times.
This video helped me to understand the concept of three point test cross and solve problems from CSIR NET question papers. Thank you sir for describing it so easily. Looking forward for more videos.
Honestly, thank you so much for posting this video. My professor did not explain this well at all, and you made it seem so simple! Here's to passing my Genetics exam tomorrow!
THANK YOU so much sir! For some reason this concept was very difficult for me to understand and I tried to watch many videos that just didn't help at all, however, this one was so clear, easy to follow, but still very detailed. I appreciate it! You are a great teacher! In just 30 minutes you touched on basically every important thing related to three-point test crosses. Wish you were my professor!
Thank you so so very much for making this video, I have been struggling with this concept for two semesters and yours is the only video on TH-cam that laid it out so plainly and without confusion! Keep up the great educating!
Seems like you took your time! sometimes my professor is too fast in explaining topics this one explained it on a deeper and easy to understand level. Thank you for helping me understand this better.
You did such a great job explaining this. I have been scouring the internet for a video as good as this one and I am so happy I finally found it. You are an amazing teacher, thank you so much.
Thank you so much! My professor went over it once in class and never again so it's going through and finding things like this to help teach myself that got me through and made me successful in the class.
My god, the man fixed those percentage errors last minute! Props to those catches! Great video! (For any of those confused about what I'm referring to: he wrote 45/1000 = 4.5%. In fact it equals 0.045%.)
thank you for making this video! I was struggling with my assignment and looking for some explanation videos and I come to this video and this is really help me, finally I can solve the problem in my assignment.
Wow, Thank you so much ! Oh, I wish that my lecturer at least may learn from you regarding how to teach well and how to guide properly without wasting time!
All you have to do is determine what the double crossover would be (if they had occurred). You will have two possible arrangements with 0 individuals, so those are the double crossover. If someone listed for you all of the offspring of a 3-pt. test cross and there were no double crossover, then you just figure out which two classes of individual are missing. They are the double crossover. Does that make sense?
instead of looking for a double cross over in order to order the genes,could it still be accurate to use the distance between genes,and the gene intermediate between two other genes be the one in the middle?
great work sir i just have one question, is there any way that the number of the offsprings with parental phenotypes would be lower than the number of recombinant ones or we should always the highest numbers as parental?
Is there any way? Yes. Doing recombination mapping, like the 3-point test cross, assumes that all of the phenotypes are equally viable. But, if one of the parental phenotypes had a lower viability due to its combination of genes, then it is very possible that there would be fewer parental individuals in that class than in one of the recombinant combinations. In that case, the three point test cross would give you erroneous results and your maps would be incorrect. However, you might be able to figure this out and make a corrections. For example, if the a b c individual were less viable (therefore many died), it is very possible that the A B C individual would be healthy and have plenty of offsprings. If there is no viability problem, then the proportion of a b c and A B C should be approximately the same. If you see that one of these reciprocal classes (like a b c) has way too few individuals, you could "correct" that number to be the same as the other class (like A B C) and do the calculations from there. Good question.
This gentleman is now retired, congratulations, and thank you for the excellent explanation.
This video beautifully explains one week of lectures I had in genetics (and didnt understand) in 30 minutes. Thank you sir for your time!
+Funksolid You're welcome.
Glad to help.
I would give anything to have you as my Genetics professor. Well done! Thank you, thank you, thank you!
people like you on youtube make me rethink paying thousands of dollars for classes at a 4 year University. You made something I had no grasp of extremely understandable in a fraction of the time I've spent on our course textbook software and online lecture tools. Thank you so much.
This is a resource for my class at the 4-year university where I teach: Samford University, Birmingham AL. We'd be glad to have you in our Biology department. 😁
I almost cried with relief after you explained such a complicated topic so simply! Thanks sooooooo much!
omg. i wish you were my professor. I sat in the lecture for 2 hours, but had no idea what my professor was talking about. But i got the concept less than one minute after watching your video. Thank you so much
My head was jammed before watching this. Calmed my mind and watched the whole video. Everything is clear. Now I am able to solve more problems like these. Thanks Professor.
Much appreciated! You've taught me more than my lecturer and tutor in these 32 minutes than they have in the past 4 weeks. Thumbs up!! Hope you have a wonderful day Sir :)
Thanks.
Please never stop teaching, you're a life saver!
You sir are a prophet of chemistry and I have been enlightened.
I have searched for more than 50 videos on this topic because I am an absolute beginner. YOUR VIDEO IS THE BEST !!! and really helped me.
Thanks for such a detailed explanation.
Loved it !!
Thanks a lot
You're welcome. Thanks for your kind words.
Sir, you are brilliant in all aspects of teaching. Your lessons have truly left a remarkable impact on my life, and with that, I hope to pass on your teachings to those around me in an effort to spread knowledge and positivity. I hope all goes well for you in life and I hope that you truly understand the significance of education that you helped spread across the internet. Thank you.
The BEST video on the topic I've found! You make it so easy. I've already shared with classmates.
You just helped me understand and finish an assignment that needed a 3 point test cross and the ensuing calculations. THANK YOU!
Thanks, Professor Dr. David A. Johnson, You have explained so very beautifully that I am in awe of understanding this concept which eluded me throughout the week. May God bless you and keep you safe in these trying times.
NO WORDS TO EXPLAIN HOW GREAT YOUR EXPLANATION IS. SIMPLY AMAZING! THANK YOUUUUUUUU!
Thanks. Glad it helped.
You have no idea how much help you've given, great teaching - you're a credit to the profession.
Studying for genetics final - had to come watch this video again. Truly great explanation.
Great job sir! ✔️✔️✔️ You did an awesome job in explaining 💯💯💯💯
This video helped me to understand the concept of three point test cross and solve problems from CSIR NET question papers. Thank you sir for describing it so easily. Looking forward for more videos.
Honestly, thank you so much for posting this video. My professor did not explain this well at all, and you made it seem so simple! Here's to passing my Genetics exam tomorrow!
THANK YOU so much sir! For some reason this concept was very difficult for me to understand and I tried to watch many videos that just didn't help at all, however, this one was so clear, easy to follow, but still very detailed. I appreciate it! You are a great teacher! In just 30 minutes you touched on basically every important thing related to three-point test crosses. Wish you were my professor!
I needed this king for my midterm tomorrow. Thank you so much for the straight explanation!
Wow..Amazing teaching skill.
Bestt Prof. of genetics and Molecular biology...
Thank you sir for Clearing this concept.
One of the best teachers ever!!! Thank you so much!!!
Taught me something I've been trying to understand for almost 2 -3 years!! Lovely grandpa!
After hours of pure desperation, it only took me 32.28 mins to get it. Thank you sooo much!
LOVE YOU SIR, you explain it so well!!! I'm french, and the frenchie girl will pass her exams thanks to you! Have a good day Monsieur!
This is the greatest video on three point test cross.
You, sir, have a talent! You have put knowledge directly into my brain. I thank you!
This is legitimately one of the BEST explanations of this I've seen! Thanks!
Thanks to you I feel much more confident about my upcoming test!
Thank you so so very much for making this video, I have been struggling with this concept for two semesters and yours is the only video on TH-cam that laid it out so plainly and without confusion! Keep up the great educating!
Absolutely terrific explanation! Thank you so much!
Seems like you took your time! sometimes my professor is too fast in explaining topics this one explained it on a deeper and easy to understand level. Thank you for helping me understand this better.
Thank you so much . I always had problem solving this kind of questions but your lecture is so clear that it overcomes my fear.
You did such a great job explaining this. I have been scouring the internet for a video as good as this one and I am so happy I finally found it. You are an amazing teacher, thank you so much.
I downloaded the video just incase it got taken off line! Best explanation ever!!!
Thank you so much! My professor went over it once in class and never again so it's going through and finding things like this to help teach myself that got me through and made me successful in the class.
Perfect and clear-cut explanation
..heartfelt gratitude sir!
Good teachers are so hard to find these days.. But sure this is one of them.
Really good explaining!! Thanks
This was soo beautifully explained by you sir !! Thank you , you cleared my concepts .
Teachers like you are rare !!!
Keep uploading more videos :)
This is a great explanation for a complicated problem! Great job with this.
final is tomorrow.
you were so clear and made it look so simple.
thank you!!!
God bless you !
I must have watched this video a million times when I was taking genetics. Now I'm rewatching it as a grad student working in a yeast lab.
Thank you so much !!! I have my genetic exam tomorrow and you made my life so much easier ! 🙌🏻
My god, the man fixed those percentage errors last minute! Props to those catches! Great video! (For any of those confused about what I'm referring to: he wrote 45/1000 = 4.5%. In fact it equals 0.045%.)
A little basic math: 45/1000 IS 4.5% (This is 4.5/100 which is 4.5%!!! Per cent is parts per 100. 4.5% = 0.045)
Ah my bad! You are indeed correct! This video helped me for my Biology Final, thanks again!
You are an absolute life saver Dave Johnson
nice!! your video enable me to jump to the next chapter, wish you bear with us.
thank you for making this video! I was struggling with my assignment and looking for some explanation videos and I come to this video and this is really help me, finally I can solve the problem in my assignment.
This is just so helpful. You saved my midterm. Thank you so much sir!
Thanks for such a clear explanation!
this is really perfect explanation of three point test cross, thank you sir
Thank you so much! Very thorough explanation!!!
What a great video! I have been struggling with this for a while, but you have made it super clear, thank you so much
I'm glad.
Lmaoo 23:36 why did homeboy just slide into frame like that
Beautifully elucidated
No ambiguity
Due regards.
Will teach my students 3 point test cross.
Wonderful explanation. Thanks for taking the time to make this video.
thank you soooo much! I appreciate your generosity in recording and posting this video
u r great sir..
thank God for having such person in this world..😊
Great explaination Sir
We want more videos like this
Love from india west bengal😊
Thx daajj. You did a great job explaining this process and its implications.
I have a test tomorrow. And this just made it easier.
The best video I found on this topic!!
Great explanation sir...hats off...
THANK YOU SO MUCH FOR TAKING THE TIME TO EXPLAIN THIS
Wow, Thank you so much ! Oh, I wish that my lecturer at least may learn from you regarding how to teach well and how to guide properly without wasting time!
It cleared so many doubts, I just can't thank you enough! Thank you!!!😊😊
This was great and thorough, I was so lost until I saw this video, thanks!
Thank you so much, I pray for you health and happiness!
You are an amazing teacher. Thanks so much!
wish my professor explained this in such plain english like this....Thank you!!!!
+QueenChunky31 Thanks!
I was struggling on this topic. Thank you so much sir
bless you! I feel far more confident, i was way off with what I was trying to calculate before.
Love from NZ
Wow!
Thank you very much sir!
You are a great lecturer! Thank you!
l was disliked three point test cross but now after seen this video. I really like.Thank you sir!!!
You're simply the best!!! Thanks a million!
You explained it brilliantly. Thank you!!
You're a lifesaver! I understand it soo much better now.
+Ci M I'm glad.
You are a LIFE SAVER .THANK YOU!!!!!
Thank you so much you helped me understand this concept so much. All the other videos did not explain the why you did thank you.
Thank you so much for your video! This makes sense now! One question: how do we determine gene order if no double crossover event occurs?
All you have to do is determine what the double crossover would be (if they had occurred). You will have two possible arrangements with 0 individuals, so those are the double crossover. If someone listed for you all of the offspring of a 3-pt. test cross and there were no double crossover, then you just figure out which two classes of individual are missing. They are the double crossover. Does that make sense?
this man is amazing. thank you so much Dave! so much better than my genetics prof :(
great explanation.. and really it help me.. a lot... thank u..
from Pakistan
Thank you so much! i wish my professor explain things like you!!
+Hassah Olbassam Thanks.
+Hassah Olbassam Thanks!
Thank you so much sir ! Great work ! U saved my bio grade 🙂
what a king... thank you!!! amazing explanation
Thank you very much sir...
You are too good to explain...
Thanks a lot...
Finally I got this...THNKX to U Mr ..
I loved your explanation ! Worth listening to your video ! Thank you :D you have taught really well =]
I love this guy, I wish he was my instructor.
what a lifesaver you are! thanks!
instead of looking for a double cross over in order to order the genes,could it still be accurate to use the distance between genes,and the gene intermediate between two other genes be the one in the middle?
Yes, but this is simpler and quicker.
great work sir i just have one question, is there any way that the number of the offsprings with parental phenotypes would be lower than the number of recombinant ones or we should always the highest numbers as parental?
Is there any way? Yes. Doing recombination mapping, like the 3-point test cross, assumes that all of the phenotypes are equally viable. But, if one of the parental phenotypes had a lower viability due to its combination of genes, then it is very possible that there would be fewer parental individuals in that class than in one of the recombinant combinations. In that case, the three point test cross would give you erroneous results and your maps would be incorrect. However, you might be able to figure this out and make a corrections. For example, if the a b c individual were less viable (therefore many died), it is very possible that the A B C individual would be healthy and have plenty of offsprings. If there is no viability problem, then the proportion of a b c and A B C should be approximately the same. If you see that one of these reciprocal classes (like a b c) has way too few individuals, you could "correct" that number to be the same as the other class (like A B C) and do the calculations from there. Good question.
Thankyou for this wonderful lecture.
you just saved my life
Glad I did. I'm sure it's a life worth saving.
Thank you so much. This was incredibly helpful, you explained it very well.
Thank you sir,you are amazing teacher.
Thank you Sir. It explained me a lot what I had confusions
thank you so much for making this video! It is incredibly helpful