Mitosis and Meiosis Worksheets - PowerPoint

							 Ch 9 The Cellular Basis of Life
  9.1 Cells come from Cells
      Cells are needed for
      Mitosis: repair, growth,
      asexual reproduction (clones of one parent)
      Meiosis: sexual reproduction
      (two parents)
Video clip (3 minute overview of mitosis/cancer)



                                                    1
   9.2 The cell cycle multiplies cells
Different number of chromosomes for each
organism (humans have 46)

Interphase:
Chromosomes
duplicate
before the
cell divides



                                           2
Mitosis- nucleus divided




 and Cytokinesis-cell divides   3
               9.3 Mitosis
 Prophase=pairs
 Metaphase=middle
 Anaphase=away
 Telophase=two
 Cytokinesis animals
Cell plate plants
Onion root tip


                             4
9.4 Cancer

 Cancer is due to uncontrolled cell cycle
 Benign –local tumor
 Malignant- travels around body by
  metastasis

 Treatment=surgery, radiation,
            chemotherapy
       (some disrupt mitotic spindle)
                                             5
9.5 Meiosis is used in sexual reproduction
 Meiosis only occurs in sperm and egg so
  the new offspring doesn’t have double the
  chromosome number
 Diploid
 Haploid
 Chick embryo
 Pig embryo
 Human embryo


                                              6
Meiosis- two divisions

 Results in four
 cells




                         7
9.6 Meiosis increases genetic
          variation




                                8
             Crossing over
   In Meiosis




                             9