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Coral snow
- Thread starter joshj-16
- Start date
cornsnakekid92
trouser snake
what is the diffrents between homo and het?
Serpwidgets
New member
Homo means same, het means different.
At a given locus where we have discovered one mutant, there are two alleles: the wild-type (such as B<sup>+</sup>) and the mutant (such as b<sup>b</sup>)
At each locus, an individual inherits one of these from the mom, one from the dad. If it inherits B<sup>+</sup>·B<sup>+</sup> or b<sup>b</sup>·b<sup>b</sup> it is homozygous. If it inherits B<sup>+</sup>·b<sup>b</sup> it is heterozygous. (Like Sesame Street, same or different? hehe)
Generally wild-type is assumed to be there when nothing is mentioned. So even though het actually means it's het for those two different alleles (B<sup>+</sup>·b<sup>b</sup>) we drop the "wild-type" part and just say it's het for the mutant b<sup>b</sup> gene.
If both its copies are the mutant (b<sup>b</sup>·b<sup>b</sup>) we say it's homozygous for that mutant.
You generally don't hear "homozygous normal" because that's assumed unless specified otherwise. But that is also a genotype: B<sup>+</sup>·B<sup>+</sup>
At a given locus where we have discovered one mutant, there are two alleles: the wild-type (such as B<sup>+</sup>) and the mutant (such as b<sup>b</sup>)
At each locus, an individual inherits one of these from the mom, one from the dad. If it inherits B<sup>+</sup>·B<sup>+</sup> or b<sup>b</sup>·b<sup>b</sup> it is homozygous. If it inherits B<sup>+</sup>·b<sup>b</sup> it is heterozygous. (Like Sesame Street, same or different? hehe)
Generally wild-type is assumed to be there when nothing is mentioned. So even though het actually means it's het for those two different alleles (B<sup>+</sup>·b<sup>b</sup>) we drop the "wild-type" part and just say it's het for the mutant b<sup>b</sup> gene.
If both its copies are the mutant (b<sup>b</sup>·b<sup>b</sup>) we say it's homozygous for that mutant.
You generally don't hear "homozygous normal" because that's assumed unless specified otherwise. But that is also a genotype: B<sup>+</sup>·B<sup>+</sup>
TripleMoonsExotic
I <3 Stripes!
In simpler terms...
Homo means you will SEE the trait
Het means the specimen CARRIES the trait
Homo means you will SEE the trait
Het means the specimen CARRIES the trait
Serpwidgets
New member
That's true IF it's a recessive mutant. 
If it's dominant, you will see the trait when it's het, and only not see it when it's homo wild type.
If it's codominant, there will be three different things to see.
If it's dominant, you will see the trait when it's het, and only not see it when it's homo wild type.
If it's codominant, there will be three different things to see.
TripleMoonsExotic
I <3 Stripes!
Yup, but the kid that asked the question's 13...
What you said makes MY head spin...Imagine what he was thinking...
What you said makes MY head spin...Imagine what he was thinking...
TripleMoonsExotic
I <3 Stripes!
That, and the majority of cornsnake morphs are recessive...Thank GOD because if we had the same mess with morphs as the Beardie people do... :headbang:
Serpwidgets
New member
Heh, the reason they have problems in beardies is because they do not apply real genetics to anything.
The problem with the above description of het is that it crashes into reality... trying to "make sense" of the shortcuts is what really causes peoples' heads to spin. Ultramels and Motley/Stripes are heterozygous, so why do you see them? Now instead of having explained it in two sentences, you have to go back, unexplain what was previously explained, and start over from scratch.
But seriously, I don't get which concepts are hard to get?
1- Het is different, homo is same. That's really basic.
2- Genes come in pairs. That's easy.
3- If there are two genes + and b, there are three possible pairings:
++ (same)
+b (different)
bb (same)
Seems simple enough, too. We all played this game on Sesame Street. :grin01:
3a- If there are three genes +, b, and c, (like Motley/Stripe and Amel/Ultra) there are 6 possible pairs:
++ (same)
+b (different)
+c (different)
bb (same)
bc (different)
cc (same)
None of this should cause any head spinning. The "shortcuts" totally do, though. :santa:
The problem with the above description of het is that it crashes into reality... trying to "make sense" of the shortcuts is what really causes peoples' heads to spin. Ultramels and Motley/Stripes are heterozygous, so why do you see them? Now instead of having explained it in two sentences, you have to go back, unexplain what was previously explained, and start over from scratch.
But seriously, I don't get which concepts are hard to get?
1- Het is different, homo is same. That's really basic.
2- Genes come in pairs. That's easy.
3- If there are two genes + and b, there are three possible pairings:
++ (same)
+b (different)
bb (same)
Seems simple enough, too. We all played this game on Sesame Street. :grin01:
3a- If there are three genes +, b, and c, (like Motley/Stripe and Amel/Ultra) there are 6 possible pairs:
++ (same)
+b (different)
+c (different)
bb (same)
bc (different)
cc (same)
None of this should cause any head spinning. The "shortcuts" totally do, though. :santa:
MastersHaven
*Hopelessly Addicted*
Finally!!!
at first I was a bit confused but now that you write it out like that I understand!!!!
at first I was a bit confused but now that you write it out like that I understand!!!!
Gronk
1.1 Beautiful kids....
Serp...
You mean your whole book could have been one page long ???
Kidding, of course....but that simple explanation you gave above works.
Unfortunately, for my tiny brain, when I go to apply it to actual snakes I seem to lose it...GRRRRR. Had the same issues with math in HS and College..lol. I go into with an attitude of "never going to get it", so it never flows for me.
Thank god for my Wife...she's able to take the genetics and run with it
You mean your whole book could have been one page long ???
Kidding, of course....but that simple explanation you gave above works.
Unfortunately, for my tiny brain, when I go to apply it to actual snakes I seem to lose it...GRRRRR. Had the same issues with math in HS and College..lol. I go into with an attitude of "never going to get it", so it never flows for me.
Thank god for my Wife...she's able to take the genetics and run with it
Serpwidgets
New member
LMAO Yeah, it's like an SNL sketch: I just stretch that out into 72 pages.
(Don't tell anyone, that's just our secret, LOL.)
(Don't tell anyone, that's just our secret, LOL.)
SnakeAround
Formerly Blutengel
I'm glad I was already 'educated' in cockatiel genetics; recessive, dominant, sex-linked and different phenotypes for birds being het or homo for a morph, some morphs being dominant over some others but not over all ... But all genes are located on the same locus, that's what make sit a little easier; if a, b and c are together, they'll be inherited together, except for 1/3 of the youngsters; sometimes morphs just cross over to a gene it shouldn't be or just wanders of and doesn't settle, so it messes up the hets or homo's of the bird... So I had to take some time to understand the different loci thing with corns... sure makes it quite complicated!