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Twinning

twinning

(Science: chemistry) The assemblage of two or more crystals, or parts of crystals, in reversed position with reference to each other in accordance with some definite law; also, rarely, in artificial twinning (accomplished for example by pressure), the process by which this reversal is brought about. Polysynthetic twinning, repeated twinning of crystal lamellae, as that of the triclinic feldspars. Repeated twinning, twinning of more than two crystals, or parts of crystals. Twinning axis, Twinning plane. See the note under twin.


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Re: Brain size=IQ level theory (Blacks vs Whites & Asians)

... and Africans consistently averaged at opposite ends of a continuum with Europeans averaging intermediately. For example, the rate of dizygotic twinning based on a double ovulation is less than 4 per 1,000 births among East Asians, 8 among Europeans, and 16 or greater among Africans. Multiple ...

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by TJJ
Fri May 16, 2008 12:13 am
 
Forum: Human Biology
Topic: Brain size=IQ level theory (Blacks vs Whites & Asians)
Replies: 72
Views: 269878

HELP: regulative embryos, nuclear equivelance..,

... ------------------------------------------------ and finally For testing nuclear equivelance, the experiment of "delayed nucleation causes twinning in a newt" says that when the string is tied, the side with the nucleus divides until the 16 cells stage, and then twinning occurs. From ...

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by psychic_pizza
Sat Oct 13, 2007 11:51 pm
 
Forum: Cell Biology
Topic: HELP: regulative embryos, nuclear equivelance..,
Replies: 0
Views: 1769

HELP:Regulative embryos experiments, nuclear equivelance, ..

... ------------------------------------------------ and finally For testing nuclear equivelance, the experiment of "delayed nucleation causes twinning in a newt" says that when the string is tied, the side with the nucleus divides until the 16 cells stage, and then twinning occurs. From ...

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by psychic_pizza
Sat Oct 13, 2007 6:40 am
 
Forum: Zoology Discussion
Topic: HELP:Regulative embryos experiments, nuclear equivelance, ..
Replies: 0
Views: 2252

'Twinning'

... referring to living organisms since this is biology!! and also if the question says "Give reasons for your answer" what reason S would you give if twinning was referring to the formation of crystals?? That's easy. I would just say: No, twinning is not an example of asexual reproduction. Reason: ...

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by DJ
Thu Nov 24, 2005 8:03 pm
 
Forum: Human Biology
Topic: 'Twinning'
Replies: 9
Views: 4581

'Twinning'

... referring to living organisms since this is biology!! and also if the question says "Give reasons for your answer" what reason S would you give if twinning was referring to the formation of crystals??

See entire post
by zenith_beth
Thu Nov 24, 2005 1:48 pm
 
Forum: Human Biology
Topic: 'Twinning'
Replies: 9
Views: 4581
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