Domestication and Genome Evolution

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knabe

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when i hear desirable phenotype, i don't hear what was lost. and the connections, circumstances that drove the undesirable alleles.
 

knabe

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it might be interesting at this point to look at breeds that seem to have different immune responses and how that relates to different things.


like say a sire who has no milk and why and why even through several generations, that effect has not been diluted very much.


at this point, the idea of breeds is simply a group of animals that had minimal infusion, usually because of a valley, distance or some other geographic limitation.  that is really all a breed is, along with a certain color pattern and here, its a couple to 5 genes, some really small amount that gives the illusion of a breed, ie polling and black hide.  there really is no such thing as a breed, only isolated populations and a bottleneck of some sort.


breeds are simply a way to have, well, you know......




 

Hopster1000

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knabe said:
at this point, the idea of breeds is simply a group of animals that had minimal infusion, usually because of a valley, distance or some other geographic limitation.  that is really all a breed is, along with a certain color pattern and here, its a couple to 5 genes, some really small amount that gives the illusion of a breed, ie polling and black hide.  there really is no such thing as a breed, only isolated populations and a bottleneck of some sort.


breeds are simply a way to have, well, you know......

Switch "breed" for "race" and it's just the same. However, people become proud of that valley or geographic location and what their culture can give to the world, even if the genetic difference is so small.
Maybe that's why people are also proud of their breed, especially if it comes from the same valley as themselves, and what it can bring to the world.
Of course then people make those miniscule genetic human differences an issue unfortunately.
 

librarian

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knabe said:
when i hear desirable phenotype, i don't hear what was lost. and the connections, circumstances that drove the undesirable alleles.
All this is information found along the path while (whilst) I am searching for something to tie selection for “favorable” casein alleles to mutations ( amino acid substitutions) involving myostatin, growth hormone, energy metabolism, etc etc etc. In this paper, they mention a selected for casein allele resulting in firmer cheese...if I read it correctly.
The favorable/unfavorable language takes me back to Maynard Smith in 1974, “The Hitch-Hiking Effect of a Favorable Gene” in terms of a simpler time in terms of single genes and single actions.
 

librarian

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To hopster, yes. In these times of mega dairies owned by investors from abroad, silage piles rising like from the South Dakota prairie like landfill mountains, and beef sires being genotyped for optimal cross breeding traits to re-dual purpose the robot managed milk cows...one cannot wonder about the true vastness of “what is lost” by artificial selection. A few of us still sit under a tree and watch our cattle graze a hilltop, and this is something ancient and human, not racial or national.
 

librarian

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And why is this website so infuriatingly clunky to use. One must remain stubbornly persistent to attempt to converse with old friends on distant hilltops or remote valleys. I know the technology for fast and easy transmission of information is far beyond what we are rolling along with here, like pioneers in wooden wheeled wagons, over large stones and fallen cactus.
 
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