Meiosis and Fertilisation

Cards (22)

  • 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 shown in the diagram of a normal human cell?
    Four pairs of chromosomes
  • What type of cells contain single chromosomes?
    Gametes
  • 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 times does the cell divide during meiosis?
    Twice
  • How many gametes are produced from one original cell in meiosis?
    Four gametes
  • What is true about the genetic makeup of the gametes produced by meiosis?
    They are genetically different from each other
  • What do gametes contain in terms of chromosomes?
    Single chromosomes
  • 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?
    The new cell divides by mitosis
  • What is formed as the embryo develops?
    Different 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 is the relationship between meiosis and fertilization?
    • Meiosis halves the number of chromosomes
    • Fertilization restores the full number of chromosomes
    • Gametes join during fertilization
  • What happens to the fertilized egg after fertilization?
    • Divides by mitosis
    • Forms an embryo
    • Cells differentiate into various types