Just when I thought I had it straight...
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Re: Just when I thought I had it straight...
Thought something was a little off. I couldn't wrap my mind around what a hetrozygous chestnut was. Duh. It's hetrozygous black. :roll:
I was thinking a ee would be homozygous red as it would always pass a "e". I wasn't thinking homo or hetro had to do with what color the foals actually turned out to be. Makes more sense now.
Thanks!
Re: Just when I thought I had it straight...
The more I think about it, the more I think that it is likely that the heterozygous is not suppose to be there when talking about the mares and they used a color calculator for the numbers. If you didn't know whether a red mare was AA, Aa or aa and set each of them as being equally likely in a color calculator, I bet you would get numbers similar to those. The same if you didn't know what a bay mare (E? A?) or a black mare (E? aa) was and you weighted everything equally. My guess is that these people don't have a complete grasp of what genetics terms actually mean and are just putting words where they think that they belong.
Re: Just when I thought I had it straight...
Yeah, I was right in where they got their numbers from. If you put smokey cream (Ee aa) as the sire and the dam by their phenotype with agouti and extension as unknowns, then this color calculator spits out the percentages they list.
http://www.animalgenetics.us/CCalculato…" onclick="window.open(this.href);return false;
Re: Just when I thought I had it straight...
[quote="Heidi"][quote="Andrea"]
Your foal will never be bay when breeding to Whitey's Bar.[/quote]
I beg to differ on this point. My black-based foal will *[u]certainly[/u]* be bay if my mare ([i]bred to Whitey[/i]) is AA.[/quote]
Yes, they could be bay-based, but he can't produce a bay phenotype.
Re: Just when I thought I had it straight...
The problem with them using the calculator is that they assume that there is an equal chance that the horse has each possible set of alleles. I believe it is in TBs that the majority of them are Aa or AA so assuming that there is an equal chance of a chestnut TB mare being aa as AA is statistically inaccurate. If a bay mare comes from a long, long line of nothing but bays, then it would be more likely for her to be AA instead of Aa than a mare that comes from a line of mostly blacks with only a couple individuals that have bay in them. The only way to get marginally accurate percentages is to individually look at each horses pedigree to come up with the likelihood of what genotype they would have.
Re: Just when I thought I had it straight...
[quote="Monsterpony"]
Yes, they could be bay-based, but he can't produce a bay phenotype.[/quote]
Well....even that is SLIGHTLY incorrect...
[img]http://www.blazingcoloursfarm.com/Bonk%…]
[img]http://www.blazingcoloursfarm.com/Bonk%…]
Re: Just when I thought I had it straight...
[quote="Andrea"]LOL... I guess you're right then. Do you have baby pictures of him?[/quote]
He is a her ;) lol but yes here are some baby pictures of her, where she does look more buckskin.
[img]http://www.blazingcoloursfarm.com/faith…]
[img]http://www.blazingcoloursfarm.com/bnka…]
Re: Just when I thought I had it straight...
Ummm...not sure exactly where they are getting those numbers from. The stallion is a smokey creme and is Ee aa CcrCcr according to their test results. The Ee is what they mean by heterozygous red (h/z for red is the same thing as h/z for black since both mean Ee).
The heterozygous (h/z) red versus h/z bay or h/z black makes no sense though. A horse can't be h/z for red and be a red mare as by definition she would be black-based since h/z for red means Ee. I think they have there extension and agouti genes confused.
An ee Aa (H/Z red, h/z agouti) mare would have 50% palomino, 25% buckskin and 25% smoky black.
An Ee Aa (h/z red and agouti) mare would have 25% palomino, 37.5% buckskin and 37.5% smoky black.
An Ee aa (h/z red and H/Z non-agouti) mare would have 25% palomino and 75% smoky black.
Edit to add:
h/z= heterozygous
H/Z= homozygous