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Fundamentals of Genetics

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  • What is DNA and where is it found?

    DNA (deoxyribonucleic acid) is found in the nucleus and contains instructions for the organism. It has a helical structure and is bound by histone proteins.

  • What is RNA?

    RNA (ribonucleic acid) is a nucleic acid involved in protein synthesis and gene expression.

  • Define a gene.

    A gene is a specific sequence of DNA (or RNA in some viruses) that contains instructions to make proteins or functional RNA molecules. It is the basic unit of heredity.

  • Where are genes located in eukaryotes and prokaryotes?

    In eukaryotes, genes are on chromosomes inside the nucleus. In prokaryotes, genes are on a single circular DNA molecule in the cytoplasm.

  • How many genes does a typical human cell have?

    A human cell has about 20,000-25,000 genes spread across 23 pairs of chromosomes.

  • What is the difference between dominant and recessive genes?

    Dominant genes are expressed and visible in the individual, while recessive genes are present but not necessarily expressed.

  • What does genetics study?

    Genetics studies genes, heredity, variation, how traits are inherited, gene expression, mutations, and genetic interactions.

  • Define genome.

    The genome is the complete set of DNA/RNA in an organism, including all genes and noncoding sequences, representing the entire genetic material.

  • What is genomics?

    Genomics is the study of the entire genome and how genes interact with each other and the environment, with applications in medicine, biotechnology, and agriculture.

  • What are chromosomes?

    Chromosomes are long threadlike structures made of DNA and proteins (mostly histones) that carry genes arranged linearly. Humans have 46 chromosomes (23 pairs).

  • What happens if chromosomes are not equally distributed during cell division?

    Unequal chromosome distribution can cause syndromes, such as Down syndrome caused by an extra chromosome 21.

  • Define traits.

    Traits are observable or measurable characteristics of an organism, which can be inherited or influenced by the environment.

  • What is phenotype?

    Phenotype is the physical expression or observable characteristic of a trait, resulting from the interaction of genotype and environment.

  • What is genotype?

    Genotype is the genetic makeup of an organism, representing the genetic recipe for traits.

  • What is DNA replication?

    Replication is the process of producing an identical copy of DNA.

  • What is transcription in genetics?

    Transcription is the process where DNA is copied into messenger RNA (mRNA) inside the nucleus.

  • What is translation in genetics?

    Translation is when mRNA is read by ribosomes in the cytoplasm to assemble amino acids into proteins based on codons.

  • What roles do proteins play in genetics?

    Proteins act as enzymes, hormones, structural components, and signaling molecules, determining traits and carrying out life processes.

  • Give an example of a gene-protein-trait relationship.

    The hemoglobin gene codes for hemoglobin protein, which transports oxygen in red blood cells. Mutations can alter the protein and affect the trait.

  • Why is DNA essential for cells?

    DNA contains the instructions for cell function and reproduction; without it, cells cannot operate properly, leading to disease.