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#50473 - 07/06/05 05:07 PM What does the term HET mean?
Badgersmommy Offline
Glider Slave

Registered: 04/30/05
Posts: 1382
Loc: Kentucky
It's making me nuts! LOL Het= <img src="/ubbthreads/images/graemlins/nixweiss.gif" alt="" />
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Glider Kids - Badger and Bonnie, Pepsi and Grace, Victoria.. ahem..I mean ummm..Victor! and Isabella <img src="/ubbthreads/images/graemlins/smile.gif" alt="" />

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#50474 - 07/06/05 05:08 PM Re: What does the term HET mean? [Re: ]
Badgersmommy Offline
Glider Slave

Registered: 04/30/05
Posts: 1382
Loc: Kentucky
oh geesh...I think I put this question in the wrong place...
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Glider Kids - Badger and Bonnie, Pepsi and Grace, Victoria.. ahem..I mean ummm..Victor! and Isabella <img src="/ubbthreads/images/graemlins/smile.gif" alt="" />

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#50475 - 07/06/05 05:08 PM Re: What does the term HET mean? [Re: ]
Anonymous
Unregistered


It means the glider carries a gene. Like if a White Faced Blonde mates with a Grey and they have a grey baby. That grey baby is HET for White Faced Blonde, it carries the gene, but doesn't express it.

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#50476 - 07/06/05 05:09 PM Re: What does the term HET mean? [Re: ]
Badgersmommy Offline
Glider Slave

Registered: 04/30/05
Posts: 1382
Loc: Kentucky
Ahhhhh...Thanks so much!! <img src="/ubbthreads/images/graemlins/smile.gif" alt="" />
_________________________
Glider Kids - Badger and Bonnie, Pepsi and Grace, Victoria.. ahem..I mean ummm..Victor! and Isabella <img src="/ubbthreads/images/graemlins/smile.gif" alt="" />

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#50477 - 07/06/05 05:11 PM Re: What does the term HET mean? [Re: ]
Anonymous
Unregistered


genetics is confusing-lol it took me awhile to figure that one out too!

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#50478 - 07/06/05 05:39 PM Re: What does the term HET mean? [Re: ]
Anonymous
Unregistered


I believe I read somewhere that Het is short for "heterogeneous." Also, I read what littlecowgirl responded with. <img src="/ubbthreads/images/graemlins/smile.gif" alt="" />

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#50479 - 07/06/05 06:04 PM Re: What does the term HET mean? [Re: ]
Anonymous
Unregistered


Well the term HET means Heterozygous which refers to an animal that has a specific trait but does not exhibit the trait. I will use humans as an example:

Say a male with brown hair had children with a female with blonde hair. Now, given that brown hair is dominate over blonde hair, and the male has brown hair (without being Heterozygous for anything, meaning he is Homozygous for brown hair), their offspring will all have brown hair (because it is dominat over blonde) but still be heterozygous for blonde hair. Thus, if they have children with someone that have blonde hair, it is a 50/50 chance that half of their children has blonde hair. Confusing, I know... I tried to make it simple but I may have made it worse. Heh, tell me if you need me to clarify any better.

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#50480 - 07/06/05 06:46 PM Re: What does the term HET mean? [Re: ]
Anonymous
Unregistered


Heterozygous only refers to a gene sequence, not to a trait, and that gene sequence has a recessive and a dominate form. So that leucistic color variation, which is a recessive trait might have a gene sequence aa for leucistic, aA for a het for leucistic, and AA for a non gene carrier. Heterozygous only refers to the fact that the genetic sequence contains a recessive and a dominate gene. The sequences AA and aa are both homozygous, regardless of the trait they exhibit (wild type or leucistic) Now for animals that have codominance, that is that the genes do not fully mask eachothers phenotype (expression) then you cannot necessarily say that the animal is a carrier of the color variation. For example: White Faced blonde is thought to not be a simple one gene with a clear recessive and dominate but rather might be a codominant requiring two or more genes to work together in a particular sequence under specific enviornmental conditions to exhibit the phenotype (expression of gene). So that it cannot be said that an offspring of a WFB would contain exactly 1/2 of the material needed to make the sequence to produce the color and that all offspring would each receive the same 1/2 needed so that by pairing two offspring out of a WFB that do not exhibit the phenotype that you would ever be able to produce a WFB. Therefore it is not proper to call joeys from WFB parents hets for WFB since there is no real heterozygote being that the phenotype seems to be brought about through some codominate mechanism.

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#50481 - 07/09/05 03:35 AM Re: What does the term HET mean? [Re: ]
Anonymous
Unregistered


ok i just learned about this...het is kinda like hedrosexual a female and a male the oposite homo is like homosexual 2 of the same thing. So say you are breeding lulictic's. If you use a punnet square you can find out the probability that it wil be lulictic. If it is a 100 % lulictic and a 65 % lulistic het then the probability that it will be dominant and take over the ressesive gene would me around 82.5 % chance of a lulictic sugar glider. If it is 2 homozygis genes then it will be that gene no matter what. 2 ressesive homosigous genes = means th gene is resessive, 2 dominant genes = dominant gene is dominant(that is what you want, but with the right gene)a dominant and a ressesive gene means the dominant one takes over. 7 th garde science, lol.

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#50482 - 07/09/05 08:31 AM Re: What does the term HET mean? [Re: ]
sugarglidersuz Offline
Glideritis Anonymous

Registered: 08/28/04
Posts: 14788
Loc: Cleveland, Ohio
[:"green"]Ushuaia,
Thanks so much for the very accurate, succinct explanation. I have been wondering about all of that for a long time, myself, but never bothered to ask. Now that I've read your post, I completely understand the genetics involved...
<img src="/ubbthreads/images/graemlins/thanx.gif" alt="" />
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Allira & Gizmo :grey:
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:rbridge: DaisyMae; Darwin; Mareki; Mambo; Pika; Cricky; Reggie & Bobo, Pepe & Bittah


Suz' Sugar Gliders

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#50483 - 07/09/05 09:47 PM Re: What does the term HET mean? [Re: ]
Anonymous
Unregistered


</font><blockquote><font class="small">Quote:</font><hr />
If it is a 100 % lulictic and a 65 % lulistic het then the probability that it will be dominant and take over the ressesive gene would me around 82.5 % chance of a lulictic sugar glider.

<hr /></blockquote><font class="post">

It is not proper to say that "this animal is a 67% het", because you either carry the gene or you do not. It is all or none. The proper way to say it is that this animal has a 67% chance of being a het for ... variation. Also you cannot just add the probabilities and divide by two to estimate the outcome. Remember that it is an all or none if it is truely heterizygous and not codominate. Because a parent has two copies of a gene and can only pass on one copy of that gene under normal circumstances and the combinatation of the two copies determines the zygosity (heterozygous or homozygous) of the animal a punnance square can be used to estimate the likelyhood that the offspring will exhibit a certian genetic sequence, based upon the parents contributions. Most genes are not a simple one gene sequence and are infact a series genes interacting under certian enviornmental conditions to produce a phenotype, so that the use of a punnance square will not always give a precise estimate of the liklihood of a particular sequence producing a particular phenotype. A punnance square is best suited to deal with two or less gene sequence and so it will not always be practicle, espically considering that a three gene sequence will produce a 64 square cube.

Also I believe if you are trying to figure out the probablilties of lets say rolling two dice and getting two sixes you need to use factorial in your equation, I will have to get a statistics book and look this up. So that the probability of lets say the dice is (1/6 factorial X 1/6 factorial) / 2 I believe I am not sure off hand. I know it is not as simple as just adding the two probailities together and dividing by two.

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