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Lesson 6 What Is A Clone Sow
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Lesson 6 What Is A Clone Sow


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SOW lesson 6 9A

SOW lesson 6 9A

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  • 1. What is a clone?
    Learning objectives
    Children should learn:
    • that, in cloning, all genetic information comes from one parent
    • 2. to consider some of the ethical issues relating to cloning
    • 3. to ask questions to extend their thinking and refine ideas
  • Activities
    As an extension, ask pupils what they understand by the term 'clone' and where they have heard it, eg science fiction, Dolly the sheep.
    Explain the principles of cloning, emphasising that it differs from sexual reproduction in that all genetic information comes from one parent. Ask pupils to describe the consequences of this for variation between parents and offspring.
    Establish with pupils that methods of asexual reproduction, eg cuttings, grafting, have been used for many years with plants.
    Ask pupils to suggest five questions that they would ask a scientist about cloning, given the opportunity, and to explain why they think they are important.
    Help pupils to evaluate and refine their questions and to use some of the many internet sites providing information on the process to find the answers. Ask pupils what they have found and make a brief summary.
  • 4. Outcome
    explain why clones are genetically identical
    describe how asexual reproduction has been used to produce new plants
    identify ethical issues relating to cloning of animals
    use the internet to answer their questions and interpret what they have found
  • 5. Points to note
    Asexual reproduction producing clones is covered in the key stage 4 programme of study. However, most pupils will have heard of cloning and teachers may wish to discuss it here.
    As an alternative, teachers could invite a scientist to talk about their work and answer pupils' questions.
    Media reports may contain excellent explanations and graphics of the process of cloning for the 'general reader'. The internet can also be a valuable resource.
    Extension: pupils could plant cuttings, eg of geranium, and show that they grow into new plants.
  • 6. Dolly the sheep, who became famous as the first mammal to be cloned from an adult cell, has died. The news was confirmed on Friday by the Roslin Institute, the Scottish research centre which created her.
    A decision was taken to "euthanase" six-year-old Dolly after a veterinary examination showed that she had a progressive lung disease, the institute said in a statement.
    She was not old - by sheep standards - to have been put down
    Dr Patrick Dixon, expert on ethics of human cloning
    Dolly became the first mammal clone when she was born on 5 July 1996. She was revealed to the public the following year.
    Dr Harry Griffin, from the institute, said: "Sheep can live to 11 or 12 years of age and lung infections are common in older sheep, particularly those housed inside.
    "A full post-mortem is being conducted and we will report any significant findings"
    Dolly was a sheep created totally by design - even her name was picked specifically to be appealing.
    It came about during the latter stages of labour when Dolly was born.
    Stockmen involved in the delivery thought of the fact that the cell used came from a mammary gland and arrived at Dolly Parton, the country and western singer.
  • 7. Cloning row
    Her birth was only announced seven months later and was heralded as one of the most significant scientific breakthroughs of the decade.
    But it also prompted a long-running argument over the ethics of cloning, reaching further levels with the latest allegations of human cloning.
    Dolly gave birth to four lambs in her lifetime
    Dolly, a Finn Dorset, bred normally on two occasions with a Welsh mountain ram called David.
    She first gave birth to Bonnie in April 1998 and then to three more lambs in 1999.
    But in January last year her condition caused concern when she was diagnosed with a form of arthritis.