sexual reproduction

• 2 gametes join together at fertilization to form a zygote which divides and develops into a new organism
• meiosis is a type of cell division that happens in reproductive organs to produce gametes
• meiosis involves a reduction division. cells that divide by meiosis have their full number of chromosomes to start with, cells formed from meiosis have half the number.

  cells with half the number - haploid cells
• in humans there are 46 chromosomes in total (diploid) but only 23 per cell (haploid)
• cells formed by meiosis are all genetically different because each new cell has different combination of chromosomes