Chapter 1: Cell Biology
• Show students the PowerPoint slides and discuss the importance of meristems in plant cloning. They should discuss animal and plant cloning in pairs and compare the use of meristems in plant cloning with animal cloning, on the worksheet. [O3]
Explain • Ask students to explain how different cells, or organisms, divide and what form they become in the end. They should answer this on the worksheet. [O1, O2, O3]
Consolidate and apply • Ask students to write a short article to explain what is meant by cloning and describe some potential uses of this. Students should also highlight the ethical considerations of using stems cells. They should include ideas about mitosis in their article [O1, O2, O3]
Extend Ask students who are able to progress further, to: • find out more about other types of cell division, for example, budding. They could compare and contrast mitosis, meiosis, budding and forms of asexual reproduction. [O1]
Plenary suggestions • Ask students to write the definitions of all the words on their word wall. • They should make up at least five short paragraphs connecting words from each section of the word wall together.
Answers to Worksheets 1.11.2 and 1.11.2 Worksheet 1.11.1 (Low and standard demand) 1 Cell division 1. b, d, a, c 2. a. Mitosis – two new animal cells – identical daughter cells each other and to parent cell b. Mitosis – two new plant cells – identical daughter cells to each other and to parent cell c. Mitosis – differentiated cells – identical daughter cells – different from parent cell d. Mitosis – differentiated cells – identical daughter cells – different from parent cell e. Budding – two new yeast cells – identical daughter cells to each other and to parent cell Worksheet 1.11.2 (High demand) 1 Meiosis and mitosis 1. Mitosis results in growth, so the new cells must have the same function as the original cell as they will belong to the same tissues.The cells must be identical. 2. Meiosis results in the formation ofr gametes, which must fuse together to become a new cell. The two gametes must have half the number of chromosomes in order for the new cell to have a complete set of chromosomes, and not a double set. 2 Cell division See answers above (question 2; Worksheet 1.11.1). 3 Plant versus animal cloning Similarities Identical daughter cells produced Daughter cells have same number of chromosomes as parent Stem cells used
AQA GCSE Biology: Trilogy: Teacher Pack
Differences Nuclei of meristem cells do not have to be removed No electrical shock needed No ethical considerations with the use of meristems Only cells from one organism involved
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