Meiosis and Fertilisation

• What process is being discussed in this video?

  Meiosis
• What do you learn about chromosomes and gametes by the end of the video?

  Meiosis halves chromosomes to produce gametes
• How many pairs of chromosomes are in a normal human cell?

  23 pairs
• What is the chromosome composition of human gametes?

  23 single chromosomes
• Where does meiosis take place in humans?

  Reproductive organs
• What are the male and female reproductive organs in humans?

  Testes in males and ovaries in females
• What happens to chromosomes in the first stage of meiosis?

  All chromosomes are copied
• How many gametes are produced from one original cell in meiosis?

  Four gametes
• How are the gametes produced by meiosis described?

  Genetically different from each other
• What is the term for the joining of male and female gametes?

  Fertilization
• What happens to the number of chromosomes after fertilization?

  Restores the full number of chromosomes
• How many chromosomes does a fertilized egg contain?


  23 chromosome pairs
• What process occurs after fertilization?

  Cell divides by mitosis
• What is formed as the embryo develops?

  Differentiated cell types
• What types of cells are mentioned as examples of differentiated cells?

  Nerve cells and muscle cells
• What are the stages of meiosis relevant to the AQ8 specification?

  • Meiosis occurs in reproductive organs
  • Chromosomes are copied
  • Cell divides into two
  • Each cell divides again
  • Produces four genetically different gametes
• What are the key concepts related to meiosis and fertilization?

  • Meiosis halves chromosome number
  • Gametes contain 23 single chromosomes
  • Fertilization restores full chromosome number
  • Embryo develops through mitosis and differentiation