ron2
Posted : 11/14/2006 8:34:56 PM
[link
http://www.fiu.edu/%7Emilesk/Genetics.htm]http://www.fiu.edu/%7Emilesk/Genetics.htm[/link]
Above is the basic idea of mtDNA. How did I find it? Google, where you can find more sources on genetics and in greater depth than just the one site you linked. Much of the info comes from Robert K. Wayne of UCLA and his groundbreaking work in the 90's.
[link
http://www.cbclickbank.com/bioinformatics/glossary.htm]http://www.cbclickbank.com/bioinformatics/glossary.htm[/link]
Check out the section on PCR. That's it in a nutshell but you could research a more in-depth discussion on how more than one gene combines to affect another trait. It's actually fairly basic genetic understanding these days.
That is, the one site you've link has little actual genetic information on it.
As for mtDNA reducing to a single line after generations of close-sanguinity breeding, that's also an established fact, even in humans. Health problems in one line is not a reason to quit line-breeding nor is it justification to cross different breeds. While I understand the reasoning behind have a wide gene pool, each time you expand the gene pool, you also introduce new defects. Or combinations of genes that may produce a defect not found in either of the parent breeds. Shadow is a mix of Siberian Husky and Lab. Lab ears flop down. Sibe ears are held up. Shadow's ears flop down but he can hold either one or both up. Sometimes, though, when he's really excited, one ear will cramp and will pull his scalp in that direction, irritating him and he will shake his head to make it loosen. If I can, I will massage it to make it go away. I'm not aware of that cramping problem in either parent breed. So, has this cross produce a an effect of two genes that, together, produce this ability for the muscle to cramp like that?
You said you would be willing to discuss any of the articles posted in the link you posted. As I have noted, they are lacking in some basic facts on genetics, so how we can have a currently topical discussion without more of the facts?