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🔬general biology i review

key term - Gene

Citation:

Definition

A gene is a specific sequence of DNA that contains the instructions for building proteins, which are essential for the growth, development, and functioning of living organisms. Genes serve as the basic unit of heredity, passed from parents to offspring, influencing traits and characteristics. Understanding genes is crucial as they play a vital role during processes like cell division, where they are replicated and distributed to daughter cells to ensure proper functioning and continuity of life.

5 Must Know Facts For Your Next Test

  1. Genes are located on chromosomes, with humans having approximately 20,000 to 25,000 genes organized into 23 pairs of chromosomes.
  2. During cell division, specifically in mitosis and meiosis, genes are replicated to ensure that daughter cells receive identical genetic information.
  3. Mutations in genes can lead to changes in protein function and may cause genetic disorders or contribute to the development of cancer.
  4. The expression of genes can be influenced by various factors including environmental conditions, leading to variations in phenotypes even among genetically identical organisms.
  5. Genetic engineering techniques allow scientists to manipulate genes for purposes like developing disease-resistant crops or producing insulin for diabetes treatment.

Review Questions

  • How do genes contribute to the process of cell division, particularly in ensuring genetic continuity?
    • Genes are replicated during cell division to ensure that each daughter cell receives an exact copy of the genetic material. This replication occurs during the S phase of the cell cycle, where the DNA is unwound and duplicated. By accurately copying genes, the process maintains genetic continuity across generations of cells, which is crucial for the proper functioning and development of an organism.
  • Discuss the potential impact of mutations in genes during cell division and how they can affect an organism's phenotype.
    • Mutations in genes can occur during DNA replication if errors are made or if there is damage to the DNA. These mutations can lead to changes in the structure or function of proteins produced by those genes, ultimately affecting the organism's phenotype. Some mutations may have no effect, while others can result in genetic disorders or increased susceptibility to diseases like cancer due to abnormal cell growth and division.
  • Evaluate how understanding gene function can inform advancements in medical therapies related to cell division abnormalities.
    • Understanding gene function is critical for developing targeted medical therapies for conditions arising from abnormalities in cell division, such as cancer. By identifying specific mutations that disrupt normal gene function, researchers can create treatments that specifically target these genetic defects. For example, targeted therapies may inhibit pathways activated by mutated genes or use gene therapy techniques to correct defective genes, leading to more effective and personalized treatment options for patients with these conditions.

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