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A fragment of DNA from chromosome 7 of each of two persons, Smith and Moore, are sequenced - VCE - SSCE Biology - Question 15 - 2012 - Paper 1
Question 15
A fragment of DNA from chromosome 7 of each of two persons, Smith and Moore, are sequenced. The nucleotide sequences in corresponding regions are shown below. This D... show full transcript
Worked Solution & Example Answer:A fragment of DNA from chromosome 7 of each of two persons, Smith and Moore, are sequenced - VCE - SSCE Biology - Question 15 - 2012 - Paper 1
Step 1
A. the complement of Smith's DNA strand would have the sequence
Answer
The complement of a DNA strand can be determined by replacing each nucleotide with its complement: A with T, T with A, C with G, and G with C. Thus, the complement of Smith's sequence (G A T G G A T C G A G G T C) would be C T A C C T A G C T C C A G, not matching the provided sequence.
Step 2
B. the amino acid sequence in the polypeptides translated from the DNA of Moore and of Smith would be identical.
Answer
Without knowing the specifics of the codons translated from both sequences, we cannot conclude that they will be identical. Any variation in the nucleotide sequence could lead to a different amino acid sequence due to the redundancy of the genetic code.
Step 3
Step 4
D. Moore's genetic disorder could be due to a deletion of one of the nucleotides.
Answer
Since Moore exhibits a genetic disorder and has a slightly different nucleotide sequence than Smith, this variation could be the result of a deletion or other mutation that potentially disrupts normal enzyme function, supporting the idea of a genetic disorder linked to nucleotide changes.