Married twins
seelindarun:
Quote from: talysman on 2008 April 26, 23:26:01
See, for me, the word "cause" means that the defects didn't exist beforehand. Which wrong. Inbreeding doesn't produce defects ex nihilo or damage genes in any way. It selects for already-existing genes. Breeding with the wrong person who *isn't* related can produce the same effects.
This is true but if you have lots of gene variability, i.e. a big population which breeds widely, the chances of meeting a person with exactly the same genetic defect as you becomes very small. Generally, their issues are different from yours. ;) An isolated population with few members meets the same genetic defects within itself, over and over.
Quote from: J. M. Pescado on 2008 April 26, 23:30:36
Recessive genes don't "disappear", but it IS possible to exterminate them, and quite quickly, if you set your mind to it. If you euthanise anyone afflicted with the problem, you will be applying selective pressure against that gene. If you extend this to sterilizing all of their relatives as well, either with or without testing for the gene's presence, regardless of whether they express the problem or not the problem will go away quite quickly. In the absence of selective pressure, however, gene frequencies will remain the same. With an obviously defective gene like this, allowing the afflicted to reproduce has extreme detrimental effects on the gene pool.
Natural selection only applies pressure to those who express the defective gene, which is why I didn't discuss extermination of all relatives. :D The key is really the relatives who don't express the defect. Your selection pressure would have to be thorough, and certain, that none of the relatives had escaped, otherwise the recessive gene can silently multiply again... dun dun dun
maxon:
Quote from: seelindarun on 2008 April 27, 00:00:56
Quote from: J. M. Pescado on 2008 April 26, 23:30:36
Recessive genes don't "disappear", but it IS possible to exterminate them, and quite quickly, if you set your mind to it. If you euthanise anyone afflicted with the problem, you will be applying selective pressure against that gene. If you extend this to sterilizing all of their relatives as well, either with or without testing for the gene's presence, regardless of whether they express the problem or not the problem will go away quite quickly. In the absence of selective pressure, however, gene frequencies will remain the same. With an obviously defective gene like this, allowing the afflicted to reproduce has extreme detrimental effects on the gene pool.
Natural selection only applies pressure to those who express the defective gene, which is why I didn't discuss extermination of all relatives. :D The key is really the relatives who don't express the defect. Your selection pressure would have to be thorough, and certain, that none of the relatives had escaped, otherwise the recessive gene can silently multiply again... dun dun dun
He'd likely have to kill us all too if what he was aiming for was eliminating 'bad' genes. Mind you, I can quite see that that is what he'd want.
Surelyfunke:
This actually happened to a UK couple in real life this year. They were separated at birth, met, 3-bolts, fell in love, got married. But I don't think they had children together.
Ayslhyn:
Pity Sims don't have two-headed brats. Predictably enough the twins had twins (yawn) I really hate the puter at times.
Apropos of which, is there any way to change a surname for mac-using peasants like myself? I can't warm to "Subject" as a last name (yes, Nervous was one of the adopting parents)
Swiftgold:
Quote from: talysman on 2008 April 26, 02:59:44
Quote from: Quinctia on 2008 April 26, 02:22:55
Quote from: morriganrant on 2008 April 25, 23:11:07
Quote from: talysman on 2008 April 25, 22:33:23
Why would there be genetic effects for inbreeding?
O_o because there are in real life?
After several generations of inbreeding, there is an increased occurance of traits caused by recessive genes, which may or may not be deterimental. While inbreeding is a universal cultural taboo for good reasons, one occurance of incestuous reproduction isn't going to net anyone a three eyed baby or anything.
Exactly. I suppose it depends on what Swiftgold meant by "genetic effects", but it's a common myth that inbreeding causes defects. It doesn't. It just reduces genetic variability and brings out any defects that may already be present in the bloodline. Given the fact that sims don't have any defective genes, there's no reason for inbreeding to affect them at all.
Yeah, the only effects the Sims can end up with are That Horrible Nose or That Hideous Jawline. If there were other things they inherited it might be more interesting, but...
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