A person is heterozygous for a locus on Chromosome 1. The first copy of Chromosome 1 has the sequence 5′-AACTACGA-3′; the second copy has the sequence 5′-AACTTCGA-3′. Which of the following statements correctly describes theses sequences?
A) They contain a SNP that may be useful for genetic mapping.
B) They identify a location where only one copy could be cut by a restriction enzyme.
C) They contain an STR that may be useful for forensic analysis.
D) They may carry out RNA interference.

Question

Quizplus · Accepted Answer

The sequences differ by a single nucleotide (A vs. T), which is a single nucleotide polymorphism (SNP). SNPs are useful for genetic mapping.

A Person Is Heterozygous for a Locus on Chromosome 1