Multiple Choice
Which of the following statements accurately describes a typical gene?
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1. Introduction to Genetics
Fundamentals of Genetics
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Which description is the best definition of a single nucleotide polymorphism (SNP)?
A
A chromosomal rearrangement involving the exchange of large DNA segments
B
A mutation that results in the deletion of an entire gene
C
A sequence of three nucleotides that codes for an amino acid
D
A variation at a single base pair position in the DNA sequence among individuals of a species
Verified step by step guidance1
Understand that a single nucleotide polymorphism (SNP) refers to a variation at a single base pair position in the DNA sequence among individuals of a species.
Recognize that SNPs are the most common type of genetic variation and involve only one nucleotide change, such as a substitution of one base for another.
Differentiate SNPs from other genetic changes like chromosomal rearrangements, which involve large segments of DNA, or mutations that delete entire genes.
Note that a sequence of three nucleotides coding for an amino acid is called a codon, which is unrelated to the definition of an SNP.
Conclude that the best definition of an SNP is a variation at a single base pair position in the DNA sequence among individuals of a species.
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