M*****n 发帖数: 16729 | 1 【 以下文字转载自 WaterWorld 讨论区 】
发信人: tend (tend), 信区: WaterWorld
标 题: Re: 表兄妹通婚
发信站: BBS 未名空间站 (Mon Mar 5 18:45:54 2012, 美东)
近亲结婚从一个种群上来讲,是有利有弊的。如果种群基数少,近亲结婚可能会造成种
群灭种;如果种群基数大,近亲结婚能淘汰有害基因,使种群更健康。 |
y**********n 发帖数: 478 | |
D*a 发帖数: 6830 | |
l**********1 发帖数: 5204 | 4 U sure?
even Yeast xxx better than non xxxx
Coelho MA, Gonçalves P, Sampaio JP.
Evidence for maintenance of sex determinants but not of sexual stages in red yeasts, a group of early
diverged basidiomycetes.
BMC Evol Biol. 2011 Aug 31;11:249
Abstract
BACKGROUND:
The red yeasts are an early diverged group of basidiomycetes comprising sexual and asexual species.
link:
//www.ncbi.nlm.nih.gov/pubmed/21880139
and
Pound GE, Doncaster CP, Cox SJ.
A lotka-volterra model of coexistence between a sexual population and
multiple asexual clones.
J Theor Biol. 2002 Aug 21;217(4):535-
Abstract
At carrying capacity, small advantages in competitive ability can compensate
a sexual population for its two-fold disadvantage in growth capacity when
facing invasion by asexual mutants. In this paper, we develop a generic
analytical model to consider the ecology of a sexual population comprising
equal numbers of males and females, competing for shared prey resources with
multiple female-only clones. We assume that the clones arise from the
sexual population and are distinguished from it only by having narrower
resource niches and twice the growth capacity. For sexual populations, at
density-dependent carrying capacity, intra-specific competition between
clonal individuals prevents them from realizing their two-fold advantage in
intrinsic growth. This prediction leads to three novel outcomes: (i) a
sexual population can coexist with any number of clones, provided their
combined competitive impact remains less than the impact of the clones on
each other; (ii) a sexual species can immediately exclude asexual invaders
if it is a fast growing and strong competitor of shared resources and also
has refuge in an abundant alternative resource; (iii) the rate of
accumulation of clones in a sexual population will be slowed by intra and
inter-specific competition amongst the clones themselves, in addition to the
competitive impact from the original sexual population.
link:
//www.ncbi.nlm.nih.gov/pubmed/12234759
Conclusion:
如果yeast 种群基数大,Yeast近亲结婚能淘汰Yeast有害基因,使Yeast种群更健康。
【在 y**********n 的大作中提到】![](/moin_static193/solenoid/img/up.png) : 扯淡 : 鉴定完毕
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l**********1 发帖数: 5204 | 5 Bingo
especially to India and Hou-Qin...
【在 M*****n 的大作中提到】![](/moin_static193/solenoid/img/up.png) : 【 以下文字转载自 WaterWorld 讨论区 】 : 发信人: tend (tend), 信区: WaterWorld : 标 题: Re: 表兄妹通婚 : 发信站: BBS 未名空间站 (Mon Mar 5 18:45:54 2012, 美东) : 近亲结婚从一个种群上来讲,是有利有弊的。如果种群基数少,近亲结婚可能会造成种 : 群灭种;如果种群基数大,近亲结婚能淘汰有害基因,使种群更健康。
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y******n 发帖数: 8667 | 6
你是说生的孩子大半都死掉?或是残疾,因而没有后代的可能性大?那不是连好的基因
也淘汰掉了?
【在 M*****n 的大作中提到】![](/moin_static193/solenoid/img/up.png) : 【 以下文字转载自 WaterWorld 讨论区 】 : 发信人: tend (tend), 信区: WaterWorld : 标 题: Re: 表兄妹通婚 : 发信站: BBS 未名空间站 (Mon Mar 5 18:45:54 2012, 美东) : 近亲结婚从一个种群上来讲,是有利有弊的。如果种群基数少,近亲结婚可能会造成种 : 群灭种;如果种群基数大,近亲结婚能淘汰有害基因,使种群更健康。
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M*****n 发帖数: 16729 | 7 dont be confused.
i don't think what Trend claims is correct.
【在 y******n 的大作中提到】![](/moin_static193/solenoid/img/up.png) : : 你是说生的孩子大半都死掉?或是残疾,因而没有后代的可能性大?那不是连好的基因 : 也淘汰掉了?
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y******n 发帖数: 8667 | 8
Why?
近亲可以存化血统。但是哪怕是绝大多数的好基因,只要有一个坏基因,基本就是非残
既死。
【在 M*****n 的大作中提到】![](/moin_static193/solenoid/img/up.png) : dont be confused. : i don't think what Trend claims is correct.
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p*****m 发帖数: 7030 | 9 想想纯种马 纯种狗 纯种牛羊猪就知道了
【在 y******n 的大作中提到】![](/moin_static193/solenoid/img/up.png) : : Why? : 近亲可以存化血统。但是哪怕是绝大多数的好基因,只要有一个坏基因,基本就是非残 : 既死。
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M*****n 发帖数: 16729 | 10 please google Hardy-Weinberg Equilibrium
the low-frequency mutations will not be completely eliminated by inbreeding.
at least math and genetics say so.
【在 y******n 的大作中提到】![](/moin_static193/solenoid/img/up.png) : : Why? : 近亲可以存化血统。但是哪怕是绝大多数的好基因,只要有一个坏基因,基本就是非残 : 既死。
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y******n 发帖数: 8667 | 11
inbreeding.
这又不矛盾。突变有好有坏,也有不好不坏的。并且大多是隐性的。存化后,就显出来
了。
【在 M*****n 的大作中提到】![](/moin_static193/solenoid/img/up.png) : please google Hardy-Weinberg Equilibrium : the low-frequency mutations will not be completely eliminated by inbreeding. : at least math and genetics say so.
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y******n 发帖数: 8667 | 12
原则上是。纯种才能表现出一些优良基因。但是,筛选时的不好的个体都是被放弃的。
人也这样做?
【在 p*****m 的大作中提到】![](/moin_static193/solenoid/img/up.png) : 想想纯种马 纯种狗 纯种牛羊猪就知道了
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w***x 发帖数: 265 | 13 那些自交的物种不也活得好好的么
各有各的活法。。 |
w***u 发帖数: 17713 | 14 生殖隔离的形成,新物种的诞生不就这么来的吗?
恋兽癖和乱伦是各有优势啊,你们不要互相看不起对方。 |