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Reproduction, Genetics and Inheritance
Quick questions on Cell division and chromosomes explained: O-Level Biology
6short 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 chromosome number?Show answer
Human body cells contain 46 chromosomes, arranged in 23 pairs. One of each pair came from the mother and one from the father.
What is mitosis?Show answer
Mitosis is the type of cell division that makes new body cells for growth and the repair of tissues, and for asexual reproduction. In mitosis:
What is meiosis?Show answer
Meiosis is the type of cell division that makes gametes (sperm and egg cells) in the reproductive organs. In meiosis:
What is q1?Show answer
State the relationship between a gene and a chromosome. [1 mark]
What is q2?Show answer
State how many chromosomes are in a human body cell and in a human gamete. [2 marks]
What is q3?Show answer
Explain why gametes must have half the number of chromosomes. [2 marks]
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