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Post by betty on Apr 6, 2014 7:10:17 GMT -8
I know that the percentages from colour genetics are just numbers - and genes can combine in any way - but am I missing something here with my current pair?
They have had 11 pups in the past from 2 litters; 5 Blacks; 4 PEWs and 1 Slate. However, their genes from these litters suggests they could have a possible 7 colours.
Now I didn't know their full genetic make up before breeding (what with the PEW) so here are the genes for definite and then my guesses after seeing the pups:
Dad - Nutmeg: aa Cc(chm) ee P* U*
Mum - PEWhite: *a c(chm)* ** pp *u (parents: LCP Slate + CP Agouti)
Dad - Nutmeg: aa Cc(chm) ee Pp Uu
Mum - PEWhite: aa c(chm)c(chm) EE pp *u
Have I done something totally obvious with the genes that's wrong - or do you think it's just bad luck with the gene mixing for this couple.
She had her final litter yesterday so I am hopeful....
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Post by ashtree93 on Apr 11, 2014 12:52:49 GMT -8
Your mum, the PEW could be either c(chm) or c(h) if the parent was a LCP slate. With the uw, she has to be Uwuw, otherwise you would expect more slates rather than blacks. With some colours, such as Burmese, its rarer to get them, especially with the p gene.
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Post by betty on Apr 12, 2014 22:46:52 GMT -8
I had ruled out the c(h) after all the blacks - but since one of her earlier pups has been mixed with a black pup from another litter, I can see it isn't as dark. And it certainly isn't a slate, so maybe there IS an (h) in there after all?
Her new litter (7 days) are colouring up nicely - and I might be jumping the gun - but one looks light but not white and I am hoping that she does have the c(h) and it's a Siamese! Probably just a Sapphire though....
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Post by ashtree93 on Apr 13, 2014 6:39:14 GMT -8
You'd need both a c(chm) and c(h) to change the colour if a black gerbil. Unlike argentes, dehs etc you need to recessive c genes to alter the colour.
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Post by ashtree93 on Apr 13, 2014 6:52:02 GMT -8
Ive just been playing on a gerbil gene calculator. The most likely outcome of these 2 are PEWs at 25% and blacks at 18.8% I would say that you've had bad luck with the pup outcomes.
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Post by Shooting Star on Apr 13, 2014 12:13:37 GMT -8
This doesn't seem unusual at all. You can't visually tell a Cc[h]-Black from a Cc[chm]-Black. But the main thing most people don't take into account is that the C-locus and the P-locus are linked. In short, that means that C-P- and c[-]c[-]pp are actually more likely than the Mendelian 25%; C-pp and c[-]c[-]P- are actually less likely than the Mendelian 25%. So that's another reason you're seeing mostly Blacks (C-  and PEWs (c[-]c[-]pp). |
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Post by gerbillover9612 on Apr 13, 2014 14:17:15 GMT -8
Im just wondering what colour would you call a gerbil that is white with faded black patches on him, like mottled?
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Post by betty on Apr 14, 2014 1:04:01 GMT -8
Thanks Shooting Star - that will be the thing I am missing.
I have bred CPs before but they all had both A and a and I haven't seen the PEW ratio veer too far off the normal 25%; but this lot were both aa parents and it's been nearer 50% PEW so I thought I would ask. Mind you I might not be too good at spotting the REWs (but I have an older REW and their eyes seem so much pinker than hers?)
In the new litter, it looks like 2 black, 3 PEW/REW and 2 other pale pink-eyes yet to be clearly seen without pulling the nest apart (she has tucked them in so snug this litter) - so hopefully the monotone curse has been lifted!
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Post by betty on Apr 15, 2014 2:20:04 GMT -8
Almost but not totally: both were Sapphires - so I have white, black and grey babies.....
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and PEWs (c[-]c[-]pp).
