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What are the odds of finding non-coding DNA that by chance in a given reading frame...

What are the odds of finding non-coding DNA that by chance in a given reading frame would have an open reading frame of length 20 if each nucleotide occurs at equal frequency in the genome?

1. 38%

2. 36%

3. 17%

4. <1%

4. 42%

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Answer #1

the odds of finding non-coding DNA that by chance in a given reading frame would have an open reading frame of length 20 if each nucleotide occurs at equal frequency in the genome would be-

4) <1%

This is because genes that code for proteins only comprise open reading frames (ORFs) consisting of a series of codons that specify the amino acid sequence of the protein that the gene codes for.

The ORF begins with an initiation codon - usually (but not always) ATG - and ends with a termination codon: TAA, TAG or TGA

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