The parent cell splits to produce two IDENTICAL

The parent cell splits to produce two IDENTICAL daughter cells… each with the same number of chromosomes as the parent (46 chromosomes in humans) EVERY cell in your body is doing it!

parent cell chromosomes duplicate chromosome pairs line up at middle of the cell chromosome pairs are pulled apart… and go to opposite ends of the cell divides into two identical daughter cells

Parent cell splits twice to produce four SEX cells … each with half the chromosomes of the parent (23 chromosomes in humans) ONLY special cells do it… they make gametes.

PART 1 parent cell chromosomes duplicate chromosomes exchange some genetic information chromosomes line up in middle, and pull towards ends cell divides into two cells (not identical to parent) chromosomes line up in middle & pull towards the ends of each cell PART 2 each cell divides… producing 4 sex cells… each with ½ chromosomes as parent cell

Sexual Reproduction female gamete: egg with ½ chromosomes sperm with ½ chromosomes fertilization: Zygote Embryo egg with full set of chromosomes mitosis takes over and cells reproduce DNA tells each cell what to be and what to do

Mitosis § 1 division § 2 offspring cells § offspring cells genetically identical § offspring cells have = chromosomes as parent § used in ALL cells – for growth, repair, asexual reproduction Meiosis § 2 divisions § 4 offspring cells § offspring are genetically different § offspring cells have 1/2 chromosomes of parent § used ONLY to produce sex cells

Check your chromosome math…