Define single nucleotide polymorphism. A)A single nucleotide polymorphism is the presence of a single gene at one locus. B)A single nucleotide polymorphism is a variation in a single base pair in a DNA sequence. C)A single nucleotide polymorphism is a truncated chromosome. D)A single nucleotide polymorphism is a missing chromosome in a set. E)A single nucleotide polymorphism is when a single nucleotide controls the allele's phenotypic expression.

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A single nucleotide polymorphism (SNP) is a variation in a single base pair in a DNA sequence. SNPs can occur throughout the genome and may affect an individual's susceptibility to certain diseases or their response to drugs. The other options (A, C, D, and E) do not accurately describe what an SNP is.

Define Single Nucleotide Polymorphism