1. Intro to Meiosis

2. Confusing Terms
Homologous chromosome: chromosomes that are alike in appearance and in the type of genetic information they carry
Diploid: # of chromosomes in normal somatic (body) cells. 2n
Haploid: # of chromosomes in the gametes (reproductive cells). n

3. Let’s remember mitosis
PMAT
Occurs in body cells
Identical offspring
Diploid (2n) – two sets of homologous chromosomes
In humans total # of chromosomes = 46 = 2n

4. Meiosis – What’s the difference?
Mitosis
Meiosis
Where does it occur?
Replication of cell materials
Division of Cell
# of daughter cells
Result
Importance
Body (somatic cells) Ex. Skin, liver, stomach, etc.
Cells that produce sex cells (egg and sperm) = gametes 1x 1x 1x 2x
2 cells
4 cells
2n (diploid)
n (haploid)
Genetically identical
NOT genetically identical
Creates gametes ,
reduces chromosome # in half
Produces cells for tissue growth/repair