Genetics

Since we've got the topic of genetics going, can we please talk about how co-dominance is misused by herpers?

Direct from wikipedia, until I get the MCAT and undergrad bio books out to quote to make a thread about this:

Quote:

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Incomplete dominance occurs when the phenotype of the heterozygous genotype is an intermediate of the phenotypes of the homozygous genotypes.

Co-dominance occurs when the contributions of both alleles are visible in the phenotype

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The typical example for co-dominance is blood type in humans. There are three alleles for blood type: A,B, and I.

I is recessive, and causes O blood type (don't ask me why they don't just call the allele "O", cuz I don't know). A and B are dominant to I, but co-dominant to each other.

AI = A blood type
BI = B blood type
AA = A blood type
BB = B blood type
II = O blood type

However:
AB = AB blood type. This is a correct example of co-dominance.

The pastel trait, often given as an example of "co-dominance", is in fact an example of INCOMPLETE DOMINANCE.

Thank you.

Quote:

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Originally Posted by mainbutter

Since we've got the topic of genetics going, can we please talk about how co-dominance is misused by herpers?

Direct from wikipedia, until I get the MCAT and undergrad bio books out to quote to make a thread about this:



The typical example for co-dominance is blood type in humans. There are three alleles for blood type: A,B, and I.

I is recessive, and causes O blood type (don't ask me why they don't just call the allele "O", cuz I don't know). A and B are dominant to I, but co-dominant to each other.

AI = A blood type
BI = B blood type
AA = A blood type
BB = B blood type
II = O blood type

However:
AB = AB blood type. This is a correct example of co-dominance.

The pastel trait, often given as an example of "co-dominance", is in fact an example of INCOMPLETE DOMINANCE.

Thank you.

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Think of it like this, what you describe is medel's classification system, we do not use his system in the snake world most of the time. We have a classification which works just fine for us. Just because it's not published in a book doesn't make it incorrect, since it does in fact work quite well.

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Originally Posted by OhhWatALoser

Think of it like this, what you describe is medel's classification system, we do not use his system in the snake world most of the time. We have a classification which works just fine for us. Just because it's not published in a book doesn't make it incorrect, since it does in fact work quite well.

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That's how I look at it as well. On the one hand, it'd be nice if we could somehow nudge the whole community into using more precise terminology. BUT...we're not dealing with scientists or scholars...just average folks who want a simple way to understand a complex issue.

So...when Joe Newguy asks what Bob Breeder means by co-dominant, I'm going to explain what we all know Bob Breeder really means. If I think of it though, I may remind Joe Newguy not to try this on a college biology exam. :P

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"Harry Potter is all about confronting fears, finding inner strength, and doing what is right in the face of adversity. Twilight is about how important it is to have a boyfriend."

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that's just....awesome lol

I'd just like to find out who was the first person to mis-use co-dominant instead of incomplete dominant. It's obvious that someone just slipped up, and somehow convinced everyone he was right.

Quote:

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Originally Posted by mainbutter

I'd just like to find out who was the first person to mis-use co-dominant instead of incomplete dominant. It's obvious that someone just slipped up, and somehow convinced everyone he was right.

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I don't think there was any convincing, no one cares. They could of called them type 1 type 2 and type 3... its just a classification name.