Question

Suppose each of nucleotides A, G, C and T has at the same frequency in a DNA sequence and the nucleotides appear at random. What is the average distance between two stop codons? a. about 5 codon b. about 64 codons c. about 10 codon d, about 21 codon
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Answer #1

Suppose ecah of nucleotides....distnace between two stop codons?
The answer is d. about 21 codons.

The explanation is
The total number of nucleotides in DNA = 4, so the probability of A or G or C or T nucleodies = 1/4.

The probability of stop codons is (ATT, ATC, ACT) 1/4 * 1/4 * 1/4 = 1/64.
which means for every 64 nucleotides there is a chance of one stop codons. As each codon has 3 nucleotides, the propbability for reperation is 64/3 = 21.3, so the answer is 21.

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