Therapeutic Cloning - AQA GCSE Biology Revision

Key Concepts

• Chromosomes and DNA:
  • Chromosomes carry genetic information in DNA.
  • Mitosis ensures new cells have the same genetic information.

Therapeutic Cloning

• Stem Cell Transplantation:

  • Can use patient's own stem cells or donor cells.
  • Patient's stem cells are genetically identical, reducing rejection risk.
  • Donor cells are not genetically identical; fewer complications if from a close relative.

• Therapeutic Cloning Technique:

  • Involves transferring the patient’s nucleus to an egg cell with the nucleus removed.
  • Produces stem cells genetically identical to the patient.
  • These stem cells can potentially be used for transplantation but haven’t yet been used for treatment.

Benefits and Risks of Stem Cells in Medicine

Benefits

• Potential for treating untreatable conditions.
• Growing organs for transplants.
• Advancing medical research.

Clinical Issues

• Uncertain success rates for therapies (e.g., replacing nerve cells for Parkinson’s).
• Difficulty in finding suitable stem cell donors.
• Challenges in obtaining and storing embryonic stem cells.
• Risk of mutations and contamination in cultured stem cells.

Ethical Issues

• Use of unused embryos from IVF as a stem cell source.
• Controversy on creating and destroying embryos for therapeutic cloning.
• Ethical concerns about commodifying embryos.
• Debates on the status and rights of embryos.

Social Issues

• Need for public education on stem cell capabilities and limitations.
• Balancing benefits against ethical objections.
• Concerns about exploitation due to unreviewed commercial clinic research.

Additional Resources

• Cell Structure - AQA
• Interactive Activity: Mitosis - AQA
• Transport in Cells - AQA
• Sample Exam Questions - Cell Biology - AQA

Remember, there are no simple answers in this field, and it is important to consider multiple perspectives.