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Cloning methods and implications in biology

Inheritance, variation and evolution • Variation and evolution

Key concepts

What you'll likely be quizzed about

  • Tissue culture involves extracting small sections of plant tissue or individual cells and placing them on sterile nutrient medium with growth hormones to develop new plantlets in vitro.
  • Maintaining sterile conditions prevents contamination and allows growth monitoring.
  • Once established, plantlets are transferred to soil, resulting in multiple clones of the parent plant.
  • In contrast, taking cuttings entails removing a section of stem or leaf and encouraging root formation in soil or water.
  • While cuttings involve less specialized equipment, they produce fewer clones and come with a higher risk of disease transmission.
  • Tissue culture is particularly suited for industrial-scale propagation due to its ability to rapidly generate many identical, disease-free plants under optimal conditions.

Flashcards

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Definition of adult cell cloning (somatic cell nuclear transfer)

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Adult cell cloning replaces the nucleus of an ovum with a diploid nucleus from a donor body cell, stimulating development so the resulting embryo is genetically identical to the donor.

Key notes

Important points to keep in mind

Tissue culture grows plant cells on sterile nutrient media, producing many clones quickly.

Cuttings are simple and low-tech but can transmit diseases from parent to offspring.

Embryo splitting increases identical offspring from one fertilization event and utilizes surrogate mothers for implantation.

Adult cell cloning employs a donor body-cell nucleus in an enucleated egg; reprogramming often limits success and the health of clones.

Cloning accelerates the spread of beneficial traits but diminishes genetic diversity and elevates disease and ecological risks.

Genetic modification combined with cloning can yield medical proteins in animals, improving therapeutic supply while raising ecological and ethical questions.

Regulatory considerations, animal welfare, and long-term ecological effects shape the acceptability of cloning applications in agriculture and medicine.

Aseptic techniques and vigilant monitoring are vital in tissue culture to prevent contamination and avoid crop loss.

Cloning methods vary in scale, cost, and technical complexity; method selection depends on the specific purpose and inherent limitations.

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