Meiosis and fertilisation

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

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

  23 pairs
• What type of chromosomes do gametes contain?

  Single chromosomes
• How many single chromosomes does a human gamete contain?

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

  In reproductive organs
• What are the male and female reproductive organs called?

  Testes and ovaries
• 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?

  It is restored to normal
• How many chromosome pairs does a fertilized egg contain?

  23 chromosome pairs
• What process occurs after fertilization?

  Mitosis
• What is formed as a result of mitosis after fertilization?

  An embryo
• What happens to cells as the embryo develops?

  They differentiate into different cell types
• What types of cells are mentioned that differentiate in animals?

  Nerve cells and muscle cells
• Where can you find questions on meiosis and fertilization?

  In the revision workbook