Answer: Heritable changes in gene expression without DNA sequence change (e.g., methylation, acetylation).
- A Permanent, irreversible changes occurring within the underlying DNA nucleotide sequence itself
- B Heritable changes in gene expression without DNA sequence change (e.g., methylation, acetylation)
- C Random point mutations that arise spontaneously during ordinary DNA replication
- D Environmental effects that mainly influence seedling growth rate in young plants
Correct answer: B. Heritable changes in gene expression without DNA sequence change (e.g., methylation, acetylation)
Explanation: Epigenetics: heritable changes in gene expression not involving DNA sequence changes. Includes DNA methylation, histone modification.
Punnett square for a monohybrid cross between two heterozygous (Tt) parents, showing the 3:1 phenotypic ratio predicted by Mendel's Law of Segregation.
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 →