Presentation on theme: "Meiosis and Mutations. Remember: Mitosis - takes place in regular body cells (somatic cells) and you end up with 2 identical diploid (2n) cells where."— Presentation transcript:
Remember: Mitosis - takes place in regular body cells (somatic cells) and you end up with 2 identical diploid (2n) cells where “n” = the # of chromosomes.
What is it? Who does it? Where does it happen? Why does it happen? Why is a different process needed? Meiosis Making sex cells (sperm & eggs) All sexually reproducing organisms To allow organisms to reproduce 1)Chromosome # needs to be cut in half 2)Creates genetic diversity (can help evolution of species) In males- in the testes In females- in the ovaries
Meiosis Meiosis - takes place in sex cells (gametes) and you end up with four haploid (n) cells b/c there are 2 divisions (Meiosis I & II) –Female = egg –Male = sperm
Diploid adult MITOSIS FERTILIZATION MEIOSIS Haploid gametes Diploid zygote Meiosis allows sex cells to join to form a complete set of chromosomes/instructions to make a new organism.
There is no new genetic information introduced in Mitosis –everything is identical What about Meiosis? –YES, NEW genetic information is introduced! Genetic variation makes us all look different! –½ from mom & ½ from dad