Which statement about SNPs in the human genome is true?
A)Most SNPs have an effect on phenotype.
B)Any two human genome copies will have on average 3 million single nucleotide polymorphisms.
C)SNPs refer only to deletions or insertions, not base substitutions.
D)Most SNPs are located in the introns of genes, and thus effect phenotype.

Question

Quizplus · Accepted Answer

SNPs (Single Nucleotide Polymorphisms) are common variations in the DNA sequence, and it is estimated that any two human genomes differ by about 3 million SNPs. These variations are a major source of genetic diversity among humans. Most SNPs do not have a direct effect on phenotype because they either occur in non-coding regions of the genome or do not result in a change in protein function. SNPs can involve base substitutions, not just deletions or insertions.

Which Statement About SNPs in the Human Genome Is True