Erwin Chargaff investigated the nucleotide composition of...

Erwin Chargaff investigated the nucleotide composition of DNA. He analyzed DNA from various organisms and measured the relative amounts of adenine (A), guanine (G), cytosine (C), and thymine (T) present in the DNA of each organism. The table below contains a selected incomplete data set of his results. Source of DNA Adenine Guanine Cytosine Thymine Sea urchin 32.8% 17.7% 17.3% 32.1% Salmon 29.7% 20.8% 20.4% 29.1% Wheat 21.8% 22.6% E. coli 24.7% 26.0% Human 30.4% 30.2% Ox 29.0% Based on the results above, what is the best approximation of the relative abundance of thymine in the Wheat DNA? 21.8% 22.6% 55.6% 27.8%

Transcript

00:01 So, in this particular question, we are given that irwin chagher was a scientist and he studied the composition of dna in various organisms, right? so what he measured was in this particular composition of dna is the amount of bases that are present and we all know that co -bases are present, nitrogenous bases are present in composition of dna, adenine, guanine, cytosin and thine.

00:26 So now in the solution i will be using a for a.

00:30 G for g g for g g for cytosin and t for thymion now he has asked us that a table is given to us and the question we are asked that we need to tell the relative abundance of guanine and that too in human dna now we are given in the table that the amount of adenine in human dna of all the basis is 30 .4 % and the amount of thymein is 30 .2%.

01:03 Right? so now let's start with our solution.

01:06 So we all know that whenever we are talking about adenine, so adenine always pairs with thymine, right? they are the complementary base pairs and cytosin is always going to pair with guanine, right? so if two adenine are present, so that means two thymine must be present to form the pair.

01:29 Then only a pair would be formed.

01:31 So now, as we can see in the given, this is justifying it, that the amount of adenine present with us is 30 .4%.

01:40 And the amount of thymine present with us is 30 .2%.

01:46 So that means they are forming a pair.

01:49 So in human dna, we all know that a total of everything, that means the basis present in a human dna will be 100%.

01:58 Right if we are summing up all the pairs that is the amount of adenine plus thyme plus cytosine plus quinoine so it will be forming 100 % of all right now we can clearly see here right we can clearly make out that adenine present with us is 30 .4 % and timing that is present with us so in this question which is given to us is 30 .2 % cytosin and guanine we don't know and this forms 100%...

Question

Please give Ace some feedback