Final answer:
The imprinting control region (ICR) involved in genomic imprinting on chromosome 15 is an epigenetic sequence that regulates the expression of nearby genes.
Step-by-step explanation:
The imprinting control region (ICR) involved in genomic imprinting on chromosome 15 is an epigenetic sequence. Epigenetic changes refer to heritable modifications to DNA or chromosomal proteins that alter gene expression without changing the DNA sequence.
In the case of genomic imprinting, the ICR contains DNA methylation and histone acetylation modifications that regulate the expression of nearby genes by determining which allele (either from the mother or father) is active and which is silenced.