Multiple choice

The regions of human chromosomal DNA, which are stably unmethylated are known as _________.

  1. minisatellite DNAs

  2. microsatellite DNAs

  3. CpG islands

  4. short tandem repeats

  5. none of these

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

About 1% of human chromosomal DNA is stably unmethylated, these regions are called CpG islands, since they contain more than 50% of C+G. These sequences are used as powerful markers for genome mapping.