2020HSCMultiple choice

Q17

1 mark

Question

There are about 10 million single nucleotide polymorphisms (SNPs) found in the human genome. Four SNPs are modelled in the diagram.
The SNPs modelled do not affect the phenotype of the individuals shown. Which is the best explanation for this?
A. Only one nucleotide is different at each SNP.
B. The SNPs are part of DNA that is not expressed.
C. AGA, CAA, TAT and CTC all code for the same amino acid.
D. The SNPs are present on one strand of the DNA molecule only.

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Syllabus alignment

Module 5 · Heredity

DNA and Polypeptide SynthesisAssess how genes and the environment affect phenotypic expression.
Genetic VariationAnalyse frequencies of population characteristics and single nucleotide polymorphisms.

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