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 a 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, making them Single Nucleotide Polymorphisms (SNPs). SNPs can be used as genetic markers for mapping genetic traits and diseases in populations. In this case, the presence of the two different sequences in the population suggests genetic variation that can be linked to a trait or disease of interest. Choices B, C, and D are not applicable since the sequences alone do not provide evidence for any protein-coding regions, disease-causing mutations or protective effects.

Imagine That You Compare Two DNA Sequences Found in the Same