I've been trying to get my head around heritability, watched lots of videos. I now understand it after watching this, thank you for explaining it so well!
I have attempted to understand explanations of heritability given by many different teachers over 5 years, and your explanation has finally made me understand the concept. Very clear. A very huge thanks to you.
You're welcome, I'm glad to hear that it finally makes sense. I can't take all the credit, I'm sure your persistence also had something to do with it :)
You explained that counter-intuitive heritability score between the different extremes very well, thank you! That makes the concept of heritability much more clear.
This was extremely helpful, thank you so much! I also find the condensed notes you write really helpful - they make it easy to follow along and extract the key concepts but also allow me to keep focused on what you're saying!
Sure, range of reaction is the idea that based on your genes you have a range of possible outcomes depending on the environment you end up in. So for IQ imagine you could be between 90 and 110 based on your genes, and where you actually score will be influenced by environmental factors like your nutrition or access to education. Hope this helps!
@@PsychExamReview thank you.. but again while it might be true for traits such as intelligence and personality what about other phenotypes where the genetic contribution is less clear like expertise development in various domains ?? 🙏🏻🙏🏻🙏🏻
@@englishwithanes For domain-specific skills the range will be very broad and environment & training will matter a great deal. For example, someone with a high IQ might have a large range of potential for a skill like chess, but if they have no experience then their skill will be very low. So for specific skills time spent practicing is usually a better predictor of performance.
Great video! So basically, heritability would be the ratio of "genetic variation : environmental variation," assuming a phenotypic difference in the population is present? Also, please let me know what you think of this case: Six genetically identical twins are all reared in vastly different environments, but their IQ test performance is identical. Since no phenotypic variation is present, would the heritability still be zero? This case has bothered me for a while, haha!
I think it would be more accurate to say that it's a ratio of "variance of a trait due to genes" to "total variance in the population". If there's no variation for a trait in a population (if all IQ scores are identical) then the heritability would be zero because genes are not accounting for any variation in the trait. In other words, if there's no variation then there's no variation for genes to explain.
Question: does it ever make sense to compute a heritability score on something with extremely low variance? For example, according to this score the heritability of being born with two eyes is close to 0. However, clearly our genetic code is why humans have two eyes. It’s counterintuitive
It may still make sense to calculate heritability scores when variance is low but can lead to apparently counterintuitive results if we aren't careful in how we think about them. The case you gave with eyes is a good example. We have to remember it's not a score indicating how much genes matter for having 2 eyes, it's a score for how much genes matter for why people vary in their number of eyes. If we put it in terms of why people vary it doesn't seem so strange; the main reason people vary in the number of eyes they have is environment, not genes.
Someone give this man an award
I've been trying to get my head around heritability, watched lots of videos. I now understand it after watching this, thank you for explaining it so well!
You're welcome, glad to hear that it was helpful!
Better explained than most of the videos I came across, really sorted out things for me. Thank you so much for the video.
You're welcome, glad I could help!
This is great, I wish I came to this video sooner. No one seems to explain it like you.
Thank you.
I'm glad you found it eventually, thanks for commenting!
I have attempted to understand explanations of heritability given by many different teachers over 5 years, and your explanation has finally made me understand the concept. Very clear. A very huge thanks to you.
You're welcome, I'm glad to hear that it finally makes sense. I can't take all the credit, I'm sure your persistence also had something to do with it :)
You explained that counter-intuitive heritability score between the different extremes very well, thank you! That makes the concept of heritability much more clear.
I'm glad the explanation was helpful, thanks for commenting!
This was extremely helpful, thank you so much! I also find the condensed notes you write really helpful - they make it easy to follow along and extract the key concepts but also allow me to keep focused on what you're saying!
I'm glad to hear that the notes are helpful and not a distraction, thanks for commenting!
wow this video deserves more views, such a great explanation!!
Thanks!
Really helpful , you clarified the concept well. Thank you 😊
Thank you for being so clear and concise. I couldn't understand the P/S KA video on this topic.
Glad I could help!
This was an excellent explanation that really cleared up the concept for me. Thank you
You're welcome!
Brillian explanation thank you. I was struggling with this concept until I watched your video.
I'm glad to hear it was helpful!
Best youtube video on heritability ever!!
Thank you!!
Thanks!
Very helpful and informative session 💖
Nice explanation sir.....
This was a super explanation. Thank you very much for making the video
You're welcome, glad you liked it!
Thank you so much!❤❤The topic was well explained!
You're welcome, glad to hear that!
Thanks! Great explanations!
Thank you! Did better than my lecturer!
Glad I could help!
Can you please explain the concept of "range of reaction" please ??
Not necessarily make a whole video but just really quick here 🙏🏻
Sure, range of reaction is the idea that based on your genes you have a range of possible outcomes depending on the environment you end up in. So for IQ imagine you could be between 90 and 110 based on your genes, and where you actually score will be influenced by environmental factors like your nutrition or access to education. Hope this helps!
@@PsychExamReview thank you..
but again while it might be true for traits such as intelligence and personality what about other phenotypes where the genetic contribution is less clear like expertise development in various domains ??
🙏🏻🙏🏻🙏🏻
@@englishwithanes For domain-specific skills the range will be very broad and environment & training will matter a great deal. For example, someone with a high IQ might have a large range of potential for a skill like chess, but if they have no experience then their skill will be very low. So for specific skills time spent practicing is usually a better predictor of performance.
Thank you so much for breaking this down so well ❤️
You're welcome!
Very well explained, thank you!!!
You're welcome!
Great video! So basically, heritability would be the ratio of "genetic variation : environmental variation," assuming a phenotypic difference in the population is present? Also, please let me know what you think of this case: Six genetically identical twins are all reared in vastly different environments, but their IQ test performance is identical. Since no phenotypic variation is present, would the heritability still be zero? This case has bothered me for a while, haha!
I think it would be more accurate to say that it's a ratio of "variance of a trait due to genes" to "total variance in the population". If there's no variation for a trait in a population (if all IQ scores are identical) then the heritability would be zero because genes are not accounting for any variation in the trait. In other words, if there's no variation then there's no variation for genes to explain.
This makes sense -- many thanks!
This was great. Thanks!
You're welcome!
so good thank you
Question: does it ever make sense to compute a heritability score on something with extremely low variance? For example, according to this score the heritability of being born with two eyes is close to 0. However, clearly our genetic code is why humans have two eyes. It’s counterintuitive
It may still make sense to calculate heritability scores when variance is low but can lead to apparently counterintuitive results if we aren't careful in how we think about them. The case you gave with eyes is a good example. We have to remember it's not a score indicating how much genes matter for having 2 eyes, it's a score for how much genes matter for why people vary in their number of eyes. If we put it in terms of why people vary it doesn't seem so strange; the main reason people vary in the number of eyes they have is environment, not genes.
@@PsychExamReview This makes much sense. Very much appreciated and great work!
This is amazing, thanks!!
You're welcome!
Well explained sir
Thanks!
3:08, 6:18
so helpful!
Glad to hear that!
thank you! Very helpful)
You're welcome!
great explanation! keep the videos coming :)
Thanks, will do!
woah thanks so much
You're welcome!
THANK YOU
You're welcome!