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  1. Gene | Definition, Structure, Expression, & Facts | Britannica

    Dec 4, 2025 · gene, unit of hereditary information that occupies a fixed position (locus) on a chromosome. Genes achieve their effects by directing the synthesis of proteins. In eukaryotes (such …

  2. Genetics | History, Biology, Timeline, & Facts | Britannica

    Dec 14, 2025 · Genetics forms one of the central pillars of biology and overlaps with many other areas, such as agriculture, medicine, and biotechnology. Learn more about the history, biology, areas of …

  3. Human genetics | Description, Chromosomes, & Inheritance - Britannica

    At a more practical level, an understanding of human heredity is of critical importance in the prediction, diagnosis, and treatment of diseases that have a genetic component. The quest to determine the …

  4. Gene editing | Definition, History, & CRISPR-Cas9 | Britannica

    Nov 29, 2025 · Gene editing, the ability to make highly specific changes in the DNA sequence of a living organism. Gene editing is performed using specialized technologies, including enzymes engineered …

  5. genetics - Kids | Britannica Kids | Homework Help

    Genetics is the study of heredity, or how certain features pass from parents to their offspring, or young. Every kind of plant and animal produces young of its own species, or type.

  6. Genetic engineering | Definition, Process, Uses, Examples, Techniques ...

    Dec 5, 2025 · Genetic engineering, the artificial manipulation, modification, and recombination of DNA or other nucleic acid molecules to modify an organism. The term is generally used to refer specifically to …

  7. Gene flow | Definition, Effects, & Migration | Britannica

    The introduction of new alleles through gene flow increases variability within the population and makes possible new combinations of traits. In humans gene flow usually comes about through the actual …

  8. Recessiveness | Definition & Examples | Britannica

    All genetic traits are the result of the interactions of alleles. Mutation, crossing over, and environmental conditions selectively change the frequency of phenotypes (and thus their alleles) within a population.

  9. DNA | Definition, Discovery, Function, Bases, Facts, & Structure ...

    Dec 11, 2025 · Deoxyribonucleic acid (DNA) is an organic chemical that contains genetic information and instructions for protein synthesis. It is found in most cells of every organism.

  10. Genetic code | Definition, Characteristics, Table, & Facts | Britannica

    Dec 22, 2025 · Deoxyribonucleic acid (DNA) is an organic chemical that contains genetic information and instructions for protein synthesis. It is found in most cells of every organism.