This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
Preferential expression of the gene depending upon the parent of origin is called 
Select and explain. 
A. A. Genomic imprinting, B. B. Mosaicism, C. C. Alleles, D. D. Chimerin
A: A. Genomic imprinting
Answer: A: A. Genomic imprinting 
Explanation: Imprinting involves transcriptional silencing of the paternal or maternal copies of ceain genes during gametogenesis. For such genes, only one functional copy exists in the individual. Loss of functional alleles by deletion gives rise to diseases Refer robbins 172