Lemme help y'all out: Natural selection is: the gradual process by which heritable traits become either more or less common in a population because pressures from the environment Directional Selection is: when individuals that display a more extreme form of a trait have a greater fitness than individuals with average form of the trait. Stabilizing Selection is: when the individuals with the average form of a trait have the highest fitness. Disruptive Selection is : when individuals with either extreme variations of a trait have greater fitness than individuals with the average form of the trait. Your welcome
Simpler conclusion: directional selection - only one can survive Stabilizing - smallest and biggest can’t survive, only the middle can survive Disruptive - middle can’t survive, but the smallest and biggest can survive
It is important to also understand that you need three requirements in order for natural selection to occur: 1) Phenotypic variation: Without variation natural selection can't "select" different phenotypic values, and therefore the population cannot change. 2) Non-random association between phenotypic value (individual phenotype) and fitness (capacity of survival). If there isn't a force (like the ones she mentioned) pushing for one phenotypic value to have higher fitness, evolution by NS will not occur, this is also known as "selection". 3) Heritability: If the phenotypic value cannot be heritable, then the gene cannot be passed to the next generation, and evolution by NS cannot occur.
So basically in stabilizing selection,the mean of the population remains unchanged,we just have more individual that express the mean trait.Whereas in directional selection the mean is shifted in the opposite direction from the trait that is selected against.And in disruptive selection,we end up with 2 means with a trough in between,on either side of where the mean would have been had the distribution been normal(like in stabilizing selection).
Please can you answer my question. What is the difference between stabilizing selection and disruptive selection. Because the way you and my teacher explained it sound the same. . . . . I might have an idea the difference please let me know if I'm correct. So stabilizing favors the popular traits in a population and disruptive favors the rare and popular traits in a population but not the average. . Please reply with an answer if i'm correct because I don't want to confused Thank You.
If you had an organism that could have its genetics changed at will by an outside force, say a mad scientist, but at the cost of not being able to reproduce, only rebuilt, starting as something akin to a single cell, what selection factors would still affect the organism? The need for energy The need to move to the energy source The need to notice changes in its environmental ... And are these called "selection factors" or should I be looking for a different term? Thankyou
Bruh I had no idea what the teacher was talking about, but when I came here I understood. Thank you Teacher pet (Btw "Teachers pet" sounds like an insult tbh)
+Henny Williamson Basically as a result of disruptive selection you are expected to find either very large or very small chinook salmon males, no intermediate ones, so yeah both I guess.
both. The small and big fish will be the most common and have a larger frequency. Maybe after many many years, the medium sized fish will completely die out
I appreciate that you are trying to educate people about the process of natural selection. However, I'm afraid that the distinctions you are making are artificial and actually superimpose unnecessary complexity on to the otherwise sublimely simple principle of natural selection. There is only one type of natural selection. The consequences of the principle of natural selection produces populations that exhibit different types of EVOLUTION.
Lemme help y'all out:
Natural selection is: the gradual process by which heritable traits become either more or less common in a population because pressures from the environment
Directional Selection is: when individuals that display a more extreme form of a trait have a greater fitness than individuals with average form of the trait.
Stabilizing Selection is: when the individuals with the average form of a trait have the highest fitness.
Disruptive Selection is : when individuals with either extreme variations of a trait have greater fitness than individuals with the average form of the trait.
Your welcome
thanks
thanks!
thank you
I'm confused, what's the difference between directional and disruptive selection?
I like how you know all that but can't spell "you're" right bahahaha
So Bio exam ??
Yep
Tomorrow actually 😃
im cooked 🧍🏽♂
clean cut info in just 2 minutes! Thank you for uploading! (:
taebae hey army😂😂
Na that shit is so confusing
@@lilyroseponsa195 Ufff 😅 you are seeing profile photos instead of the video ..., here another ARMY 💜
Makes it quick and simple 👍And examples make it understandable. Thanks!
omg...dis was d fabulous channel ever watched!! made all concepts crystal cleared in 2 mins
i could not for the life of me understand this when it was taught. this is so simple and helpful. Thank you!
Very helpful. I enjoyed the clear definitions and the visual examples with graphs. Highly effective!
Loved the video so simple yet so impactful thank you for such a great explanation
this was so helpful before my exam, short sweet and to the point
Love videos like this. Clear, precise and to the point. Thank you so much!!! Please post more!!
Straight and to the point. Loved it.
Simpler conclusion:
directional selection - only one can survive
Stabilizing - smallest and biggest can’t survive, only the middle can survive
Disruptive - middle can’t survive, but the smallest and biggest can survive
So simply explained! Thank you!
Thank you for this simple explanation!
It is important to also understand that you need three requirements in order for natural selection to occur:
1) Phenotypic variation: Without variation natural selection can't "select" different phenotypic values, and therefore the population cannot change.
2) Non-random association between phenotypic value (individual phenotype) and fitness (capacity of survival). If there isn't a force (like the ones she mentioned) pushing for one phenotypic value to have higher fitness, evolution by NS will not occur, this is also known as "selection".
3) Heritability: If the phenotypic value cannot be heritable, then the gene cannot be passed to the next generation, and evolution by NS cannot occur.
This helped me so much in my exam, THANK YOU
Very well explained dear.. It helped me to explain my sister in her education. Thank you so much dear..🤗
Wow, very helpful. u just told the whole thing in just 2 minutes !!
Excellent explanation and easiest one.. thanks.😇😇😇😇😇
This video saved my life
Love it! Big help, appreciate it!
thanks so much! i’ve got a bio test tomorrow
2 mins and great info thanks
Very clear! Make more bio videozzzz!!! PLEAAAZZZ)
one of the best i have ever seen
Nice and comprehensive.
Great teaching and great examples!
Great video 👍
U r awesomeeeee 😘😘😘😘 POV u sis from Pakistan 🇵🇰 I was so worried about it I have never caught my teacher at it...tnx a lot 🤠
The intro song is a BOP lmao
rightttt
An amazing video. But the theme song is a bit loud 😂
So basically in stabilizing selection,the mean of the population remains unchanged,we just have more individual that express the mean trait.Whereas in directional selection the mean is shifted in the opposite direction from the trait that is selected against.And in disruptive selection,we end up with 2 means with a trough in between,on either side of where the mean would have been had the distribution been normal(like in stabilizing selection).
very clear cut and informative video! Glad I found out about your channel!
Short but effective...to th point..thank you
Great video! Really explained these concepts well.
Omg thanks for the examples ✿
Very well explained. Loved it
Beautifully explained
I like the starting tune.
Good stuff!
very informative thanks!
Wow super......
so straightforward it helped a lot
Omg this was so helpful thank you!!
Thank you so much for this video 😃 Would be very helpful for my bio test👍
Thank you for this
I have never felt this amount of rage until I had the wonderful idea of trying to understand bio
Please can you answer my question. What is the difference between stabilizing selection and disruptive selection. Because the way you and my teacher explained it sound the same.
.
.
.
.
I might have an idea the difference please let me know if I'm correct. So stabilizing favors the popular traits in a population and disruptive favors the rare and popular traits in a population but not the average.
.
Please reply with an answer if i'm correct because I don't want to confused
Thank You.
Teaching me everything my bio teacher doesn’t thank you 😭
Loved this
thank you!!! this is so helpful :)
Excellent
mz jacks bio class wya !!!
This helped me so much! Thank you for uploading this!
Thanks for this
this helped a lot ... thanks 😃
Perfect
Right on!
The stuff people categorize is crazy.
This is great
omg thank you!!!
good video
damn the intro though
lmao ikr
lmao ikr
Telugu lo pettandi
If you had an organism that could have its genetics changed at will by an outside force, say a mad scientist, but at the cost of not being able to reproduce, only rebuilt, starting as something akin to a single cell, what selection factors would still affect the organism?
The need for energy
The need to move to the energy source
The need to notice changes in its environmental
...
And are these called "selection factors" or should I be looking for a different term?
Thankyou
great name for the channel though...
Bruh I had no idea what the teacher was talking about, but when I came here I understood. Thank you Teacher pet (Btw "Teachers pet" sounds like an insult tbh)
Thanks! :)
shhh
Very concise and helpful!
sooo...what happens to the chinook salmon males? are they either super large or super small or both???
+Henny Williamson Basically as a result of disruptive selection you are expected to find either very large or very small chinook salmon males, no intermediate ones, so yeah both I guess.
both. The small and big fish will be the most common and have a larger frequency. Maybe after many many years, the medium sized fish will completely die out
Boom. There it is
Awesome intro :D
what does the green line represent?
Best
thx....much help🥰
awesome
"if they are eaten, they cant reproduce" :P
Or can they?
*Moon men plays*
Water Bears: Hold my beer
Water Bears: Hold my beer
Helpful
Very helpful :)
I like the intro ;)
Thanks
Clear concept in 2 minutes.b
👏👏
Fine as fuck
I need to know that beginning song
THANK YOUUUUU
I'm doing this for 8th-grade science, anyone else?
Seems like bio 11 also learns the same thing
lit intro
noice
This was really great but I don't really understand the difference between directional and disruptive, they are so similar. Sorry I'm not very smart
Nevermind I get it they are just very similar
her voice is kinda asmr
Totally nit-picky of a comment, but you can break Hardy Weinberg Equilibrium without Natural selection occurring (ex. migration, genetic drift, etc.)
tuff
adhbutha
mr loconte GM 🙎🏿♂️🙎🏿♂️
Who else is here Bc of class
thanks for a straight forward ass video. no need for a bunch of extra bs that doesn't get to the point.
2 mins lecture gave me the "concept". But i was watching a 2 hour lecture of natural selection gave me nothing just a bunch of datas!
0:14
I appreciate that you are trying to educate people about the process of natural selection. However, I'm afraid that the distinctions you are making are artificial and actually superimpose unnecessary complexity on to the otherwise sublimely simple principle of natural selection. There is only one type of natural selection. The consequences of the principle of natural selection produces populations that exhibit different types of EVOLUTION.