AQA · Biology · 8461
GCSE Biology: Meiosis
Inheritance, variation and evolution · AQA GCSE Biology (8461), specification point 4.6.1.2. Cards are generated from the exam board's own specification for "Meiosis", and every card links back to the page it came from. Specification © AQA — used with attribution.
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By what type of cell division are gametes formed?
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Meiosis.
Where in the body does meiosis take place?
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In the reproductive organs (e.g. testes and ovaries), where it produces gametes.
How many times does a cell divide during meiosis?
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Twice.
How many gametes are produced when one cell divides by meiosis?
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Four, each with a single set of chromosomes.
Each gamete produced by meiosis contains a ? set of chromosomes.
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single
Are the four gametes produced by meiosis genetically identical?
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No — all gametes are genetically different from each other.
What is the first step when a cell divides by meiosis to form gametes?
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Copies of the genetic information (chromosomes) are made.
How is the normal number of chromosomes restored after meiosis?
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At fertilisation, two gametes (each with a single set) join, restoring the full number of chromosomes.
By what type of cell division does a fertilised egg cell divide?
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Mitosis — the number of cells increases as the embryo develops.
As the embryo develops, its cells ? to become specialised.
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differentiate
What effect does meiosis have on the number of chromosomes in a cell?
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It halves the chromosome number, so gametes have a single set of chromosomes.
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