I have been reading up on the Dempseys, and apparently if 2 blue gene dempseys are bred together, 25% fry are electric blue, 25% are blue gene, and 50% are non blue gene fry. My questions are, if both parents are blue genes, why are not all of the fry blue genes, and how do you tell the blue genes from the non blue genes?
Blue Gene Jack Dempsey numbers
- Thread starter chickenlady
- Start date
Genetics, but you've got the figures slightly wrong... Expressing the ebjd outcome requires two recessive genes be in combination. Here's the deal: Each bgjd has one dominant gene and one recessive; call them B and b. Now pair up all the combinations possible if each contributes one gene to make a pair. Possiblilities are then BB, Bb, Bb (the other way), and bb. Each combination is equally likely, so 25% per combination. That gives you 25% BB which is a normal jd, 50% Bb which is bgjd, and 25% ebjd.
Thank you. But still, is there any way to tell which ones of the fry are blue genes, and which ones are straight dempseys? I understand they both look like normal dempseys, so I don't really want to waste time raising dempseys thinking they will give me some electric blues, when in reality they are plain janes. I have some BGs, and an EBJD, so next spring will be trying for more. I am just needing to know if there is any way to seperate the BGs from the normal JDs without actually breeding them. I would also hate to tell my LFS that I am selling him BGs when they were'nt.
If you have a questionable Jack Dempsey from a blue gene x blue gene cross, you want to breed it with an EBJD if possible. That way you know the offspring would be at least blue gene, and if you don't get any EBJD you know it is just a plain jack dempsey.
