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Need some help on some genetics. Long, but fairly simple

craig k. Mar 10, 2004 07:10 PM

Recently I have seen several ads for boas 66% possible het for snow. They were from a dh snow to dh snow litter. This is not possible is it?? I realize that albinos or anerys produced that way are 66% possible het, but that is because there is only one variable. Does it not make sense that a normal looking sibling would in theory be 66% het albino 66% het anery making it about 44% pos het snow, it may sound petty, but I emailed two people that had posted them, and 1 person basically said too bad that
is what I am selling them as, and the other gave me a list of big name breeders that sell them as that. I would say the only way you could have a 66%possible het snow would be if you bred either an anery or a albino def het snow to a dh snow. That would make it 100% het for one and 66% possible for the other. I would realy like to hear what everyone thinks, partially because I have 3 litters of them due by July, and last year I sold them as what they were 44% poss. Thanks for the responces. Craig Kade

Replies (11)

colbyandamber Mar 10, 2004 07:23 PM

makes since to me, i think that the words "possable het" are used a little to freely, even 100% miss.
colby laidlaw

Rainshadow Mar 10, 2004 07:50 PM

That sometimes,regardless of what everyone else says,you just have to let common sense lead the way...if you plug the formula into the Genetics Wizard,you quickly see the truth...but,you've got to laugh at the "tough sh-t" reaction,I've seen that one before!!!*lol*

craig k. Mar 10, 2004 08:00 PM

If you take their percents plug them into a litter of 16 you would get 9 normal looking babies. 4 of them would be double hets. 4/9=.4444444 or 44 percent. Thank you. Crig

mdc Mar 10, 2004 08:55 PM

Craig,
I have often thought about this, and I completely agree with you. I just didn't have the energy to try and argue it on this forum. I'm glad you do, and thanks for doing so. I have seen many people misrepresent animals lately. One guy is selling multiple animals on reptibid claiming that they are hypos that are het albino and het ghost. He then goes on to say that the sire was an albino and the dame was a hypo het albino and het ghost. None of it makes sense, plus he won't post pics of any sunglow that should have been born in the same litter.
If people are going to play around with genetics, they should take the time to fully understand them before they try to sell them. Personally I would buy a 44% het from you before I would buy a 66% het from someone just for the simple fact that you are being honest. It's just simple math and it's not that hard to figure out. People are just trying to make them sound better to make a profit.
Regards,
matt

craig k. Mar 10, 2004 09:06 PM

What really blows me away is some of the most respected people in the business are selling them as 66% poss het snow. I understand joe blow not understanding the genetics of it and making a mistake, but the big guys do it. Another example would be this year I bred one of my dh snow males to 2 of my het albinos. The babies from that will be 66% het albino and 50% het anery. So actually 33% het snow. Can I sell them as 66% or 50% het snow. I would not think so. I hope some of the people that disagree with me will post. I am open to seeing another side of this. Craig

mdc Mar 10, 2004 09:19 PM

I too am interested in what other people have to say, but I must say that I don't think there is another side to this. It is simple mathematics and there can only be one answer. It's not open to interpretation like other subjects; mathematical problems have one correct answer - PERIOD! Maybe that is just the engineer in me coming out, but I just don't understand how you can claim that 7 out of 16 snakes is 66%.

Matt Crabe

mdc Mar 10, 2004 09:23 PM

Ooops, 4 out of 9 normals would be double hets, not 7 out of 16. I got all excited and screwed up - Nothing New!

Mrbirgel Mar 10, 2004 09:19 PM

Double Het X Double Het =
When bred to each other, these boas will produce on the average (from every sixteen offspring): three albino boas (66% chance hetero for snow), three anerythristic boas (66% chance hetero for snow boa) one snow boa, four double heterozygous boas, two heterozygous for albino boas, two heterozygous for anerythristic boas, and one normal boa.

mdc Mar 10, 2004 09:29 PM

That is not the question being raised here. The idea that craig is trying to get across is that out of those 16 boas, 9 of them are normal in appearance (ie. not albino or anery). Out of those 9, only 4 are actual double het snows. So, 4/9=0.4444 or 44%. However, everybody is selling these as 66% double het snows. Is this ethical when they really only have a 44% chance of being double hets. Pretty deceiving to people who don't fully understand genetics if you ask me.

Matt Crabe

Paul Hollander Mar 11, 2004 05:10 PM

.

craig k. Mar 12, 2004 11:55 AM

I did email a few big breeders see what they thought. One just emailed me and said that if I bred my dh snow to a normal I should sell the babies as 50% poss hets even though they were only 25% possible hets. I really learned alot about some people. Most of the breeders said they would not sell 25% babies as 50% or 44% as 66%. Those are the guys I will be buying from. Thanks for the posts. Craig Kade

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