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Dictionary » Q » Quadrat

Quadrat

Definition

noun

A square or rectangular plot of land used to mark off at random a physical area to isolate a sample and determine the percentage of vegetation and animals occurring within the marked area.


Supplement

A quadrat is a tool used in ecology for sampling purposes. For instance, a quadrat is placed on ground at random to count the vegetation within the sample.


Word origin: Middle English, a square geometric instrument, rectangular area.


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Limpet Shell Profile - A Level coursework

... limpet shell shape change? Do any birds prey on Limpets? And what stats test should I use, if my method uses an interrupted belt transect with a quadrat every 5m. Im measuring the height and base width of the limpets. Maybe work out a limpet height : base ratio? I was thinking of correlation ...

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by Frogman
Sun Oct 08, 2006 7:30 pm
 
Forum: Ecology
Topic: Limpet Shell Profile - A Level coursework
Replies: 4
Views: 4617

hardy-weinberg equation

... 100% 4 pigs are 25% (aa 25%) q2=0.25 -------> q=0.5 p + q = 1 ---------->p + 0.5 = 1 -----> p = 0.5 AA (homozygotus) are p2----> 0.5 quadrat = 0.25 = 25% 2Aa (heterozygotus) are 2pq----> 2 x (0.5) x (0.5) = 0.5 = 50% so the equition is: AA + 2Aa + aa = 1 25% + 50% +25% = 1

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by victor
Fri Jun 03, 2005 12:51 pm
 
Forum: Evolution
Topic: Hardy-Weinberg equation?
Replies: 5
Views: 5442

Hardy-Weinberg mechanism of evolution

48% population are dominant H (homozygotic)=0.48= p (quadrat) p=about 0.7 p+q=1 (0.7) + q = 1 q=0.3 then how many Hh? According to the equation= p(quadrat) + 2pq + q(quadrat) so, Hh is 2pq =2x(0.7)x(0.3) =0.42 =about 42%

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by victor
Thu May 26, 2005 1:08 pm
 
Forum: Genetics
Topic: Hardy weinburg equation please HELP!!!!!!!!!!!!!!!!!!!!!!!!!
Replies: 19
Views: 7531

quadrat investigation

... are dry mass equations the same as finding out the water percentage in the soil? and can anyone tell me how to find the percentage cover using a quadrat?!?!?! :shock:

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by Obmik
Thu May 19, 2005 7:35 pm
 
Forum: General Discussion
Topic: quadrat investigation
Replies: 19
Views: 7180

quadrat investigation

... are for dry mass calculations, if any one is stuck on the method for dry mass it is below - Place 100g of soil collected from the centre of the quadrat, take care not to cause damage to any plants. - Place the soil in an evaparating dish - Place the dish in a pre heated oven set at 1050c for ...

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by cm5687
Wed May 11, 2005 5:54 pm
 
Forum: General Discussion
Topic: quadrat investigation
Replies: 19
Views: 7180
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