meiosis

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

  23 pairs
• What do gametes such as sperm and egg cells 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 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
• 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 are the stages of meiosis relevant to the AQ8 specification?

  • Meiosis occurs in reproductive organs
  • Chromosomes are copied
  • Cell divides twice
  • Four genetically different gametes produced
• What types of cells are produced from meiosis and fertilization?

  • Meiosis produces gametes (sperm and egg)
  • Fertilization restores full chromosome number
  • Mitosis produces identical cells (embryo)
• How do meiosis and fertilization relate to chromosome numbers?

  • Meiosis halves chromosome number
  • Fertilization restores normal chromosome number