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SingaporeCombined ScienceQuick questions
Biology: Genetics and Ecology
Quick questions on Cell division and DNA explained: O-Level Combined Science
5short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is mitosis?Show answer
Mitosis is cell division that produces two daughter cells that are genetically identical to the parent cell and to each other (each with the full set of chromosomes). It is used for:
What is meiosis?Show answer
Meiosis is cell division that produces four daughter cells that are genetically different from the parent and from each other, each with half the number of chromosomes. It is used to make gametes (sex cells: sperm and egg, or pollen and ovule). Halving the chromosome number means that when two gametes join at fertilisation, the full number is restored.
What is q1?Show answer
State where DNA is found in a cell and what a gene codes for. [2 marks]
What is q2?Show answer
State two differences between mitosis and meiosis. [2 marks]
What is q3?Show answer
Explain why gametes must have half the number of chromosomes. [2 marks]
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