Molecular genetics studies the molecular basis of heredity, connecting DNA sequence, gene expression and phenotype. It asks how information is copied, expressed, regulated and altered. A change in a promoter can affect how much RNA is produced without changing the encoded protein sequence, whereas a coding mutation can change the product itself. Combining sequence analysis with controlled genetic perturbations helps distinguish correlation from a mechanism linking a genotype to an observed trait. [ref]
Molecular Biology of the Cell, 4th edition by Bruce Alberts and others. Chapters 4–7, genomes, replication, gene expression and control
Molecular genetics is a branch of genetics that focuses on the molecular structure and function of genes. It combines principles from molecular biology, biochemistry, and genetics to study the role of genes in heredity, variation, and the mechanisms of genetic expression and regulation. Key areas of molecular genetics include: 1. **Gene Structure and Function**: Understanding how genes are organized, including their sequence, regulation, and the production of RNA and proteins.
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