- A The random chemical marking of DNA bases for methylation occurring during cell replication according to conventional understanding
- B Parent-of-origin-specific gene expression (some genes expressed only from maternal or paternal allele)
- C The random inactivation of one X chromosome occurring within female somatic cells in routine practice
- D The silencing of transposable genomic elements carried out by small interfering RNA molecules overall
Correct answer: B. Parent-of-origin-specific gene expression (some genes expressed only from maternal or paternal allele)
Explanation: Genomic imprinting: epigenetic silencing of one allele based on parental origin. E.g., IGF2 expressed from paternal allele only; H19 from maternal.
Concept context
Mendel's laws, inheritance patterns, DNA structure, and molecular biology. Core of NEET biology.
Read the full Principles of Inheritance and Variation notes →