Preferential expression of the gene depending upon the parent of origin is called
**Core Concept**
The preferential expression of a gene depending on its parental origin is a phenomenon where the gene is expressed differently based on whether it was inherited from the mother or the father. This concept is crucial in genetics and epigenetics, highlighting the complex interactions between genetic and environmental factors.
**Why the Correct Answer is Right**
Imprinting of genes is a process where the expression of a gene is determined by its parental origin. This is achieved through epigenetic modifications, such as DNA methylation or histone modification, which silence or activate the gene based on its parental origin. For example, the insulin-like growth factor 2 (IGF2) gene is imprinted, meaning it is only expressed from the paternal allele, while the insulin-like growth factor 2 receptor (IGF2R) gene is imprinted, meaning it is only expressed from the maternal allele. This preferential expression is essential for normal development and growth.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is not relevant to the concept of preferential gene expression depending on parental origin.
* **Option B:** This option might be related to genetic concepts, but it does not specifically address the phenomenon of gene expression based on parental origin.
* **Option C:** This option is incorrect because it does not accurately describe the concept of gene imprinting.
**Clinical Pearl / High-Yield Fact**
Gene imprinting is a critical aspect of human development, and aberrant imprinting can lead to various disorders, including growth restriction, developmental delays, and cancer. Understanding gene imprinting is essential for diagnosing and managing patients with imprinting disorders.
**Correct Answer: D. Gene imprinting**