The number of base substitution possible in amino acid codons is[1994]a)261b)264c)535d)549Correct answer is option 'D'. Can you explain this answer?

Question

Answer

As we know that out of 64 codon, 61 are sense codon which codes for amino acid and one codon can be substituted by 9 times ( as one base pair can be substituted 3 times, each codon contains 3 base pair so total 3*3=9 substitution ).   So total base pair substitution possible  equal to 9 x 61 = 549

Answer

See there are.. total 64 codes...
and out which 61 codons for amino acid..
and base subtitution is of 2 types tranversion and transition
and every code is made up of 3 bases so.. 61×3^2=549..

Answer

There are 64 codons out of which 61 are sense codon and 3 are non sense and as they are in triplet form the base pair also make 3 times pairing  i.e, 61*9=549

Answer

The number of base substitutions possible in amino acid codons can be determined by considering the number of possible changes in each position of the codon. A codon consists of three nucleotide bases, and each base can be changed to one of the other three bases (A to T, C to G, G to C or T, and T to A).

To calculate the total number of possible base substitutions, we multiply the number of possible changes in each position of the codon.

Let's break down the calculation step by step:

1. First position: The first base of a codon can be any of the four bases (A, C, G, or T). Therefore, there are four possible changes in the first position.

2. Second position: Similarly, the second base of a codon can also be any of the four bases (A, C, G, or T). Therefore, there are four possible changes in the second position.

3. Third position: The third base of a codon is often referred to as the 'wobble position' because it is less critical for the amino acid coding. In this position, there are two possibilities. The base can either change to any of the other three bases (A, C, or G) or remain the same (no change). Therefore, there are three possible changes in the third position.

4. Total possible base substitutions: To calculate the total number of possible base substitutions, we multiply the number of possibilities in each position. So, the total number of base substitutions is 4 (first position) x 4 (second position) x 3 (third position) = 48.

However, it is important to note that not all possible base substitutions result in a change in the amino acid coded by the codon. Some substitutions may still code for the same amino acid due to the degeneracy of the genetic code.

The correct answer to the question is option D, 549, which may include the consideration of all possible base substitutions, including those that do not result in an amino acid change.

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