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- Thread starter h_abeysinghe
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An allele (pronounced /ˈæliːl/ (UK), /əˈliːl/ (US); from the Greek αλληλος allelos, meaning other) is one of a series of different forms of a gene. The word is a short form of allelomorph ('other form'), which was used in the early days of genetics to describe variant forms of a gene detected as different phenotypes. Alleles are now understood to be alternative DNA sequences at the same physical gene locus, which may or may not result in different phenotypic traits. In any particular diploid organism, with two copies of each chromosome, the genotype for each gene comprises the pair of alleles present at that locus, which are the same in homozygotes and different in heterozygotes. A population or species of organisms typically includes multiple alleles at each locus among various individuals. Allelic variation at a locus is measurable as the number of alleles (polymorphism) present, or the proportion of heterozygotes (heterozygosity) in the population.
For example, at the gene locus for ABO blood type proteins in humans[2], classical genetics recognizes three alleles, IA, IB, and IO, that determines compatibility of blood transfusions. Any individual has one of six possible genotypes (AA, AO, BB, BO, AB, and OO) that produce one of four possible phenotypes: "A" (produced by AA homozygous and AO heterozygous genotypes), "B" (produced by BB homozygous and BO heterozygous genotypes), "AB" heterozygotes, and "O" homozygotes.[1]
2008 O/L paper question(maths)2 PART (B)
1.A MAN WISH TO GIVE HIS WIFE ONE HALF OF HIS LAND AND DIVIDE THE REMAINING PORTION EQUALLY AMONG HIS 3 CHILDREN,BUT DUE TO AN UNEXPECTED SITUATION ,HE HAD TO SELL 1/4 OF HIS LAND,THE REMAINING LAND WAS DIVIDED AS PREVIOUSLY INTEND.
1.AFTER SELLING 1/4 OF THE LAND WHT FRACTION OF THE LAND REMAINS?
2.WHT PORTION OF THE TOTAL LAND DID HIS WIFE RECIEVE?
3.WHT PORTION OF THE TOTAL LAND DID A CHILD RECIEVE?
4.IF DA DIFFERENCE BETWEEN THE EXTENT OF LAND THT A CHILD EXPETCTD TO RECIEVE BEFORE A PORTION WAS SOLD AND THE EXTENT OF THE LAND THT FINALLY RECIEVED IS 12 HECTARES,FIND IN HECTARES THE EXTENT OF DA TOTAL LAND?
1.A MAN WISH TO GIVE HIS WIFE ONE HALF OF HIS LAND AND DIVIDE THE REMAINING PORTION EQUALLY AMONG HIS 3 CHILDREN,BUT DUE TO AN UNEXPECTED SITUATION ,HE HAD TO SELL 1/4 OF HIS LAND,THE REMAINING LAND WAS DIVIDED AS PREVIOUSLY INTEND.
1.AFTER SELLING 1/4 OF THE LAND WHT FRACTION OF THE LAND REMAINS?
2.WHT PORTION OF THE TOTAL LAND DID HIS WIFE RECIEVE?
3.WHT PORTION OF THE TOTAL LAND DID A CHILD RECIEVE?
4.IF DA DIFFERENCE BETWEEN THE EXTENT OF LAND THT A CHILD EXPETCTD TO RECIEVE BEFORE A PORTION WAS SOLD AND THE EXTENT OF THE LAND THT FINALLY RECIEVED IS 12 HECTARES,FIND IN HECTARES THE EXTENT OF DA TOTAL LAND?
2009 O/L Batch Group!
ela machan mama ada rata patangannam wade, umbala 3 denaida inne?
no there are so many bt i knw those 2 only
cause those 2 are in my skul
HMTD
Chemicals:
hydrogen peroxide (30 %)
hexamethylenetetramine(Hexamine dry fuel tablets)
citric acid (food grade)
water
Materials:
200 ml glass beaker
glass stirring rod
ice bath
MANUFACTURE:
Fourteen grams of hexamethylenetetramine is dissolved in 45 grams of 30 %
hydrogen peroxide solution which is stirred mechanically in a beaker standing in a
freezing mixture of cracked ice with water and a little salt.
To the solution 21 grams of powdered citric acid is added slowly in small portions at
a time while the stirring is continued and the temperature is kept at 0° or below. After
all the citric acid has dissolved, the mixture is stirred for 3 hours longer while the
temperature is kept at 0°.
The cooling is then continued, the mixture is allowed to stand for 2 hours at room
temperature, and the white crystalline product is filtered off, washed thoroughly with
water, and rinsed with alcohol in order that it may dry out more quickly at ordinary
temperatures.
FORMULA:
C6H12N2O6
SENSITIVITY:
Very friction sensitive!!
Burns like nitrocellulose. Detonates in greater amounts.
Sensitive to shock, flame and heat.
Chemicals:
hydrogen peroxide (30 %)
hexamethylenetetramine(Hexamine dry fuel tablets)
citric acid (food grade)
water
Materials:
200 ml glass beaker
glass stirring rod
ice bath
MANUFACTURE:
Fourteen grams of hexamethylenetetramine is dissolved in 45 grams of 30 %
hydrogen peroxide solution which is stirred mechanically in a beaker standing in a
freezing mixture of cracked ice with water and a little salt.
To the solution 21 grams of powdered citric acid is added slowly in small portions at
a time while the stirring is continued and the temperature is kept at 0° or below. After
all the citric acid has dissolved, the mixture is stirred for 3 hours longer while the
temperature is kept at 0°.
The cooling is then continued, the mixture is allowed to stand for 2 hours at room
temperature, and the white crystalline product is filtered off, washed thoroughly with
water, and rinsed with alcohol in order that it may dry out more quickly at ordinary
temperatures.
FORMULA:
C6H12N2O6
SENSITIVITY:
Very friction sensitive!!
Burns like nitrocellulose. Detonates in greater amounts.
Sensitive to shock, flame and heat.
