meiosis

• Meiosis produces four non-identical haploid gametes (sex cells)
• Meiosis is used for sexual reproduction
• In mitosis the number of chromosomes stays the same but in meiosis it halves
• There are two types of cell division: Mitosis produces two identical diploid daughter cells, Meiosis produces four non-identical haploid gametes (sex cells)
• Meiosis

  Reduction division in a cell in which the chromosome number is halved from diploid to haploid
• Meiosis

  1. Copies of the genetic information are made

  2. The cell divides twice to form four gametes, each with a single set of chromosomes

  3. All gametes are genetically different from each other
• Meiosis occurs in the testes of men and ovaries of women
• Meiosis


  • A form of cell division which produces four non-identical, haploid sex cells or gametes (sperm and ova in humans)
• Sexual reproduction 


  When genetic information from 2 organisms combine to produce offspring which are genetically different to the parent

  Mother and father produce gametes by meiosis
• MEIOSIS


  1. Enforce the cell starts to divide, it duplicates its genetic info forming 2 armed chromosomes. After replication, the chromosomes arrange themselves into pairs
  2. in the first division, chromosomes pairs line up in the centre of the cell
  3. pairs are then pulled apart so each new cell only has 1 copy of each chromosome go into each new cell
  4. In the second division the chromosomes line up again in the centre and the arms of the chromosomes are pulled apart
• end result of meiosis

  you get 4 gametes, each with only a single set of chromosomes in it. Each of the gametes is genetically different from the others because the chromosomes all get shuffled up during meiosis and each gamete only gets half of them, at random
• when making sperm, the X and Y are drawn apart in the first division in meiosis. There’s a 50% of getting a Y chromosome. All egg cells have on X chromosome