Regular or Blue Gene JD

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AngryCichlids said:
Than whats the difference.... if you cant see it than who cares.
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The difference is that two "Blue Gene" JD are capable of producing Blue-colored fry, they carry the Blue gene even if they look like a regular JD. Regular Jack Dempsey that don't carry the recessive Blue Gene won't be able to produce Blue-colored fry even if mated with a Blue Jack Dempsey. It's really simple. You would have to mate a Male Regular JD with a female EBJD, and then mate one of the male fry with his mom in order to get EBJD fry.

The inbreeding resulting from that is the reason why the majority of EBJD develop some type of deformity and are genetically weaker than their regular counterparts.
 
cacichlids said:
The difference is that two "Blue Gene" JD are capable of producing Blue-colored fry, they carry the Blue gene even if they look like a regular JD. Regular Jack Dempsey that don't carry the recessive Blue Gene won't be able to produce Blue-colored fry even if mated with a Blue Jack Dempsey. It's really simple. You would have to mate a Male Regular JD with a female EBJD, and then mate one of the male fry with his mom in order to get EBJD fry.

The inbreeding resulting from that is the reason why the majority of EBJD develop some type of deformity and are genetically weaker than their regular counterparts.
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Correct. So to give an example, let's say "B" is the dominant regular JD gene and "b" is the recessive EBJD gene. When you breed a regular JD (BB) with an EBJD (bb), every single fry would be a BGJD (Bb), which are the carrier. If you were to then breed two BGJD together, roughly 25% of the fry would be regular JD, 50% would be BGJD, and 25% would be EBJD. If you bred a BGJD with an EBJD, 50% of the fry would be BGJD and 50% would be EBJD. These numbers are all theoretical, and the larger the sample size the closer you would get to these percentages. They can easily be figured out using a chi-square distribution.
 
jakeca77 said:
If you trust the seller then you can believe him but sometimes people can just be passing along a fish that was sold to them as something that might indeed turn out to not be what it was purported to be. Did the seller breed this fish himself? If so then you should ask to see the parents. The parents should be an electric blue and a normal looking JD.

Again, if you read up on these fish you will learn that you are not going to be able to determine whether it is a blue gene by eyeballing the fish. Just like you cannot look at a person with brown eyes and tell whether or not they can have a kid with blue eyes. The only way you are going to be able to determine if it is a blue gene dempsey is to either breed it to another blue gene or an electric blue jd and see if you get some ebjd fry. Other than that you can take it to a lab and have it genetically tested.

Just a question, do you know the difference between an electric blue and a blue gene? I just went back and read your OP and wonder if maybe you might think that they are the same thing?

It's not a bad looking fish so as long as you don't pay a fortune for it and don't have your hopes too high you should do alright. Good Luck.
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I know the difference between an electric blue JD and a regular one, I had never heard of them being called 'blue gene" before and wanted to know if it was possible for it to have and physical differences from a regular JD. I am not an expert on dempseys or genetics and did not know that "blue gene" was referring to the recessive allele responsible for electric blue JD's.

Also I am actually the seller here, I bought a breeding pair from a local shop about a year ago, the female laid eggs once but that was it. I'm just going to give this fish to a friend.
 
AcsFoolMike said:
Correct. So to give an example, let's say "B" is the dominant regular JD gene and "b" is the recessive EBJD gene. When you breed a regular JD (BB) with an EBJD (bb), every single fry would be a BGJD (Bb), which are the carrier. If you were to then breed two BGJD together, roughly 25% of the fry would be regular JD, 50% would be BGJD, and 25% would be EBJD. If you bred a BGJD with an EBJD, 50% of the fry would be BGJD and 50% would be EBJD. These numbers are all theoretical, and the larger the sample size the closer you would get to these percentages. They can easily be figured out using a chi-square distribution.
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Yes yes i know about the gene square and stuff but unless your going to dna test your fish its kind of pointless if there is no way to tell by the fishes appearance
 
Inquis said:
I know the difference between an electric blue JD and a regular one, I had never heard of them being called 'blue gene" before and wanted to know if it was possible for it to have and physical differences from a regular JD. I am not an expert on dempseys or genetics and did not know that "blue gene" was referring to the recessive allele responsible for electric blue JD's.

Also I am actually the seller here, I bought a breeding pair from a local shop about a year ago, the female laid eggs once but that was it. I'm just going to give this fish to a friend.
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Oh OK. Just wanted to make sure we weren't beating a dead horse around.. It's a nice fish. I recently purchased a female that was sold to me as a blue gene JD and I'm going to breed her to my EB male. Hopefully the seller was not just BSing me by telling me she was a BG. Maybe your friend would be able to breed your fish and confirm the genetics for you. It might make the fish more valuable. I have seen quite a few WTB ads and requests for blue gene JDs.
 
AngryCichlids said:
Yes yes i know about the gene square and stuff but unless your going to dna test your fish its kind of pointless if there is no way to tell by the fishes appearance
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You're the one who said you could physically identify the two, so I was explaining why you couldn't. Yes, the only way to identify a BGJD from a regular JD, without knowing it's lineage, is to DNA test or breed them.
 
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A regular Dempsey and one of the best i have seen in a while. Hold onto to him or make sure you get a good dollar.
 
AcsFoolMike said:
You're the one who said you could physically identify the two, so I was explaining why you couldn't. Yes, the only way to identify a BGJD from a regular JD, without knowing it's lineage, is to DNA test or breed them.
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WEll i thought we were talking about the Electric blue and didnt know there was a blue and regular.
 
My JD is identical. Great looking, with a mean personality. Nice lookin fish
 
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