Codominance and Incomplete Dominance: Non-Mendelian Genetics
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- Опубликовано: 13 июл 2024
- Some traits don't follow the rules of Mendelian Genetics! This tutorial explains the concepts of co-dominance and incomplete dominance; two common exceptions to traditional genetics.
Organisms that inherit traits via complete dominance will show the dominant trait in their phenotype. In this case, it would be a blue phenotype. Only one allele is dominant.
Organisms that inherit traits via co-dominance will display BOTH phenotypes; in this case yellow and blue polka dots. BOTH alleles are dominant. A real life example is cow coat color. A red cow crossed with a white cow will produce a calf that has red and white patches on its coat, a pattern called "roan".
Organisms that inherit traits via incomplete dominance will display a BLEND of phenotypes. In this case, the offspring would be green, a combination of blue and yellow. Neither allele is completely dominant. Real life examples include snapdragon flowers; a red flower crossed with a white flower will produce a pink flower.
00:00-00:21 Introduction
00:22-00:45 Punnet Squares Complete Dominance
00:45-00:56 Non Mendelian Genetics
00:56-1:41 Types of Dominance: Homozygous Dominant
1:41-1:51 Types of Dominance: Homozygous Dominant
1:51-2:38 Types of Dominance: Heterozygous
2:38-3:02 Codominance: Roan Cows & Blood Type
3:02-3:20 Incomplete Dominance: Flower Petals & Hair Texture
3:20-4:09 Definitions of Complete, Codominance and Incomplete Dominance
Avoid plagiarism! Cite BOGObiology!
[BOGObiology]. (2017, September 26). Codominance and Incomplete Dominance: Non-Mendelian Genetics. [Video File]. Retrieved from • Codominance and Incomp...
#codominance #incompletedominance #genetics
This was so so so so helpful! I just found this! Thank you so much for making this video!!!
Glad to hear it! Thanks for the kind words and please "stop by" the channel any time!
Hello
Thank you for this video! Clear, informative and even cute!
Glad it was helpful, Isabel!
Why did my lecturer spend so long talking about these !!! He coulda just shown this video, and would have lead to me having a better understanding. Thank you! very clear.
This is why I started making the videos to begin with; I decided students were spending way too much time note-taking in class when we could do way more interesting things! Love BOGO
Thank you so much!! I used it to study for my science test tomorrow
Sorry for the delayed response! Hope the test went well!
Great as usual..!
Thank you! Cheers!
Omg!!! Thanks for doing this video it's so so so helpful!!!! Thankyouuu❤️❤️❤️
You're very welcome, Clarisse! It was my pleasure. Sending love and (masked!) best wishes from Boston! -BOGO
Wow! That was very helpful. My teacher assigned this and it was very helpful
Thanks Matthew, glad the video was helpful! Sending love from Boston! -BOGO
Very helpful! I’ve seen this come up in distance learning.
Thanks, Hawk! Let it be known that I was making these far before it was trendy ; ) Stay safe out there!
BOGObiology Thanks!
From my understanding Incomplete dominance may appear as a blend but is truly not a blend of the two alleles. Incomplete dominance produces an intermediate phenotype between the two homozygous phenotypes. One phenotype is not completely masked and thus less of the dominant phenotype shows up. You are still able to get back to the original dominate and recessive phenotypes by crossing the heterozygous forms.
Ths for upload this video
You're so welcome, Gurdip! Sending you best wishes from Boston! -BOGO
Great video! Sorry you have to put up with all these people leaving horrific comments on your videos. =(
It's all good. Little secret; the more comments I get the more the RUclips algorithm "thinks" the video is important and the more traffic gets shunted here. So, they can be grumpy all they want, I'm laughing all the way the bank! -BOGO
@@BOGObiology Haha that's awesome!
@@henrysupple4497 Stay safe out there!
@@BOGObiologyWatched this for science class btw. Thanks! You too!
Damn i understand this more than my teacher's lectures
Glad to hear it! That's why I make these! If you think your classmates would benefit from this, I'd appreciate it if you shared it with them. Sending love and best wishes from boston! -BOGO
Great video, very clear and informative. I wish you all the likes and subscribers!!! #biolife
Thanks very much, Ivan! Do you have suggestions for future videos that would be helpful! Sending you best wishes from Boston! Love, BOGO
Amazing explanation however our professeur explained incomplete dominance in a weird manner, he said that only one allele is expressed and the other isn't however the one expressed isn't fully manifested but your explanation makes more sense but I'm confused 😅 he also said that incomplete dominance is actually two types: co dominance and semi dominance, it's sad that i understand everything however don't know the right terminology i looked up on google and no one is saying what's he's saying
What happens if you cross a complete dominant gene with a incomplete dominant/co-dominant gene, little confused about that aspect. Like is co-dominance just when you mix two complete dominant genes together or is co-dominant it's own type of gene that requires another co-dominant gene for both to express. I know incomplete dominant genes can blend with homozygous recessive genes, but can incomplete genes blend with co-dominant genes or complete dominant genes?
Thank you so much for good explanation!
You're so welcome! Sending love from Boston! -BOGO
@@BOGObiology oh wow!! I go to a college in boston!
@@user-wl8uu8mo4i Look out, we're getting snow tomorrow night and into Friday!
@@BOGObiology gotta prepare for that🥶🥶 miss snow a little tbh
How would I solve punnet squares with this? Would it be just like with Mendelian genetics? Or is it different somehow?
Great question. In the context of this video, all the "wacky" phenotypes originate from heterozygous organisms. Real life is more complicated, however.
Punnet squares are a great tool, but they just give you the "options" for offspring genotypes, and you can figure out the probabilities of each one. The genotype letters don't really mean anything unless you know what phenotype they encode for, and some other information about the gene and the trait(s) associated with it. Sometimes multiple genes work together to encode one trait, and sometimes multiple traits are encoded by a single gene. Further complicating things is the fact that genes can be switched on and off depending on context. In these contexts, Punnet squares are way less useful, but they're still handy for simple genetics problems.
BOGObiology thank you so much! It helped lots!
@@yourmotherssecret Glad to hear it. I have a couple other videos that might help clarify: one on how to do a dihybrid cross punnet square (two traits at once) and another on epigenetics (how environment switches your genes on and off).
Dihybrid Cross: ruclips.net/video/bkk__-2G2Zw/видео.html
Epigenetics: ruclips.net/video/Q8BMP6HDIco/видео.html
BOGObiology thanks!
Also u should have to made simple like this on polygenic traits epistasis and pleiotrophy
Someday, someday! There just are never enough hours in the day!!! Sending love from Boston -BOGO
Why not use dogs =(
🐶
Good question! I love dogs (I have a 65 lb ultra fluffy one, in fact). However, their genetics are super complicated, as are human genetics. Almost any easily visible trait like coat color, size, snout length etc has a whole host of genes influencing it as well as environmental causes. I needed a critter that was simple to see and to draw, and that also had traits that always conveniently follow the rules of mendelian genetics. Hence, me using "dots". Hope this helps! -BOGO
You can't breed a cow with a cow. You need a bull!!! Ha. Ha. Ha.
HA! Details, details.... but you're totally right! Sending best wishes from Boston! -BOGO
@@BOGObiology I knew you knew that, but you need to know I knew you knew that. Ha. It is impossible to stand in front of a Camera or a Crowd and not ever say something like that. I hear funny things like the two cows statement all the time. Your videos are GREAT, and you are in GREAT company.
Moo
I have to say, you're a pretty funny looking cow, Henry the Beagle!
Nani?
do not lie to them this is not very helpful
Sorry you feel that way. If you have specific feedback, feel free to leave it in a comment. -BOGO
i didnt ask
Ask what?
@@BOGObiology no one asked you
@@DrNavarrio At least you didn't like your own comment this time. Progress!
BOGObiology oh shit I’m subscribing just for that comment you killed him dude 😂👏🏻