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Het etc ?
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by Snake17 on February 28, 2005
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Hi guys. Now, my english is not perfect so I`m not familiar with all herp terms in english. I never quite understud what het means ? as in het for albino, 100% het etc. Could some one please enlightnen me ? Thank you, Alex S.
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RE: Het etc ?
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by elapidking81 on February 28, 2005
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heterozygous
In a living organism, having two different alleles for a given trait. In homozygous organisms, by contrast, both chromosomes carry the same allele. In an outbreeding population an individual organism will generally be heterozygous for some genes but homozygous for others.
For example, in humans, alleles for both blue- and brown-pigmented eyes exist, but the ‘blue’ allele is recessive to the dominant ‘brown’ allele.
Only individuals with blue eyes are predictably homozygous for this trait; brown-eyed people can be either homozygous or heterozygous.
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RE: Het etc ?
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by Snake17 on March 1, 2005
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Hi. Thank you. I knew all that but I had no ideea that that`s what het stands for. Like I said, my english is far from perfect and I`m not familiar with a lot of english scientific terms. Thanks again, Alex S.
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RE: Het etc ?
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by JTEDENS on March 2, 2005
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To expand a little further, heterozygous always refers to recessive traits. When 2 hets are bred together, statitically 25% of the offspring will have the recessive trait(homozygous), 25% will be het and 50% will be normal. When breeding a het animal to a homo animal 50% will be het and 50% will exhibit the trait(homozygous). You can determine the statistical ratios with a punette square, I may not have spelled that right. I believe it is named after Robert Punette a British scientist. If I am wrong at least 5 people on this forum will jump all over it. In addition to dominant and recessive traits there are also co-dominant traits. With co-dominants I believe you get 50% normals and 50% homozygous when you breed a normal animal to one with the trait. I don't have any animals with co-dominant traits so I don't claim to understand them fully. You should be able to click on the link below to find out more about genetics and their roles in breeding projects. http://www.geneticswizard.com/f_start_genetics_wizard.asp
Regards, John
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RE: Het etc ?
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by JHarrison on March 2, 2005
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Actually, if you breed two het animals you get 25% recessive, 50% het and 25% homozygous for the dominant trait. You are right that if you breed a het to a homozygous individual you get 50% het and 50% homozygous. Het and homozygous wild-type animals tend to all look wild-type, or normal.
Co-dominance is a lot more complicated. However, the allele ratios found in Punnet squares are always the same- its the way the alleles are expressed in the animal that differs with co-dominance. So, instead of the het animals looking 'normal' or wild-type, they are some intermediate form.
There are also different types of albinism, so occasionally two albinos breed and reproduce all normal looking offspring. In this case the alleles for albinism are carried on different genes. All the babies, however, will be 'double-het' for the two different types.
The basis of all this is pretty simple- I would reccomend looking at the website or any introductory biology book to get a basic understanding of genetics.
-Kristen
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