When variations in a single base are responsible for the difference between two alleles, the resulting condition is known as
A) X inactivation.
B) an imprinted gene.
C) a SNP.
D) a mutation.

Question

Quizplus · Accepted Answer

Single nucleotide polymorphisms (SNPs) are variations in a single base that can cause the difference between two alleles. X inactivation and imprinting involve epigenetic alterations and affect groups of genes, not just single nucleotides. Mutations can also cause differences between alleles, but this term is more general and can include larger changes in the DNA sequence beyond a single nucleotide.

When Variations in a Single Base Are Responsible for the Difference