Imagine that you compare two DNA sequences found in the same location on homologous chromosomes.On one of the homologs,the sequence is AACTACGA.On the other homolog,the sequence is AACTTCGA.Within a population,you discover that each of these sequences is common.These sequences _____.
A)contain an SNP that may be useful for genetic mapping
B)identify a protein-coding region of a gene
C)cause disease
D)protect against disease
E)none of the above

Question

Quizplus · Accepted Answer

The two sequences differ by only one nucleotide, which is called a single nucleotide polymorphism (SNP). SNPs can be used as genetic markers for mapping purposes, and the fact that these sequences are common within the population suggests that they may be useful for this purpose. The other options (B-D) are not supported by the information given in the question.

Imagine That You Compare Two DNA Sequences Found in the Same