Rat genetics

[toyota89]

Are there any good web sites that can tell me which rat colors are dominant co dominant or recessive?

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[satomi325]

All colors other than black and agouti are recessive.

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[sorraia]

afrma.org has some good information. There are a few other sites out there but I would have to look them up again.

A quick run down of some genetics for you:

Dominant
"ticked" (agouti) - A
unmarked (self) - H
Downunder - Do? (not a gene I worked with, not very familiar with it)

Co-dominant
Burmese - Bu/bu ("double Burmese" gives you sable)
Pearl - Pe/pe ("double pearl" is lethal in utero)
Rex - Re/re ("double rex" is aka "patchwork hairless" and "mock hairless")

Recessive
"unticked" (black) - a
blue - g ("d" in UK)
Russian blue - d ("rb" in UK)
mink - m
"brown" (chocolate) - b
red eye dilute (beige) - r
pink eye dilute (champagne) - p
albino - c
colorpoint - c^h (the color point gene will create Siamese and Himalayan, Siamese has two colorpoint genes while Himalayan has one colorpoint and one albino)
recessive hooded markings - h with a variety of modifiers (two "h" genes will give you hooded markings, a heterozygote will have Berkshire markings, the variety of modifiers on this locus give you a variety of other markings)
dumbo - du
hairless - cu? (another gene I have not worked with, apparently there are a number of different hairless genes, but only a couple are in the pet populations)

- - - Updated - - -

afrma.org has some good information. There are a few other sites out there but I would have to look them up again.

A quick run down of some genetics for you:

Dominant
"ticked" (agouti) - A
unmarked (self) - H
Downunder - Do? (not a gene I worked with, not very familiar with it)

Co-dominant
Burmese - Bu/bu ("double Burmese" gives you sable)
Pearl - Pe/pe ("double pearl" is lethal in utero)
Rex - Re/re ("double rex" is aka "patchwork hairless" and "mock hairless")

Recessive
"unticked" (black) - a
blue - g ("d" in UK)
Russian blue - d ("rb" in UK)
mink - m
"brown" (chocolate) - b
red eye dilute (beige) - r
pink eye dilute (champagne) - p
albino - c
colorpoint - c^h (the color point gene will create Siamese and Himalayan, Siamese has two colorpoint genes while Himalayan has one colorpoint and one albino)
recessive hooded markings - h with a variety of modifiers (two "h" genes will give you hooded markings, a heterozygote will have Berkshire markings, the variety of modifiers on this locus give you a variety of other markings)
dumbo - du
hairless - cu? (another gene I have not worked with, apparently there are a number of different hairless genes, but only a couple are in the pet populations)

[snakesRkewl]

I believe black is recessive too?

OP:
http://www.afrma.org/rmindex.htm

[satomi325]

I believe black is recessive too?

OP:
http://www.afrma.org/rmindex.htm

Is it? My mistake.
Then Agouti is the only dominant.

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[sorraia]

I believe black is recessive too?

OP:
http://www.afrma.org/rmindex.htm

That is true, black is recessive.
What confuses people is the dominant allele for many loci gives black coloration by default. Doesn't mean the black is dominant, just means by default there is no other color for the "non" (i.e. "non-blue", "non-mink", "non-biege", etc) to be.

Is it? My mistake.
Then Agouti is the only dominant.

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There are actually a couple colors that are dominant (or co-dominant) besides agouti, but for the most part the majority are recessive.

[sorraia]

Sorry for the double post above. My computer was freaking out as I was trying to post.

[satomi325]

There are actually a couple colors that are dominant (or co-dominant) besides agouti, but for the most part the majority are recessive.

What else would be dominant? You only listed agouti in your original post as the only color dominant. And I'm not talking about co-doms because those are different.



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[sorraia]

What else would be dominant? You only listed agouti in your original post as the only color dominant. And I'm not talking about co-doms because those are different. Sent from my DROID RAZR using Tapatalk 2

I didn't list it in my original post, but there's a gene that causes Siamese, Himalayan, and albino to have black eyes instead of red. This gene is a simple dominant, but currently not very common in the US (more common in the UK). I listed Downunder (a marking) as dominant, but it looks like I might be mistaken on that. I recalled it being dominant according to what others in the rat fancy have said, but a quick search is listing it as an allele on the H-locus.

For the OP (and anyone else interested), here's another website besides AFRMA. It is a UK site though, so some of the colors and genes may be labeled differently from North America. For example, in the UK the blue gene is denoted "d" (for "dilute") while in North America it is labeled "g" (for "gray"). http://www.ratz.co.uk/genetics.html

[satomi325]

I didn't list it in my original post, but there's a gene that causes Siamese, Himalayan, and albino to have black eyes instead of red. This gene is a simple dominant, but currently not very common in the US (more common in the UK). I listed Downunder (a marking) as dominant, but it looks like I might be mistaken on that. I recalled it being dominant according to what others in the rat fancy have said, but a quick search is listing it as an allele on the H-locus.
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I understand that down under was a marking, which is why I didn't mention it since the topic was about colors. I only asked about more dominants because it sounded like there are more dom color types. Either way, still sound info. Thanks for the clarification.

Snakesrkewl(Jerry) who posted above is experienced in breeding Black eyed siamese.

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