Chromosomes Diploid: contains 2 sets of chromosomes  Body cells, 2n Haploid: contains 1 set of chromosomes  Gametes, sex cells, n Sister chromatids- 2 identical chromatids held together by a centromere Kinetochores: protein complex that develops on either side of centromere.

Phases of Mitosis Prophase  Centrosomes have duplicated  Chromatin condenses into chromosomes  Spindles forming  Nucleolus and nuclear envelope disappear Metaphase  Centromeres/chromosomes aligned along middle  Spindles attach to kinetochore Anaphase  Sister chromatids are pulled apart and daughter chromosomes move toward opposite poles.  Cleavage furrow begins to form Telophase  Nuclear envelope and nucleolus reappear.  Chromosomes begin to uncoil

cytokinesis Division of the cytoplasm Animal cell  Cleavage furrow forms  Band of actin filaments (contractile ring), forms a circular constriction Plant cell  Golgi apparatus forms vesicles which move along the microtubules to the region of a small disk seen between the 3 daughter plant cells  Cell plate (newly formed plasma membrane) forms between the daughter cells

Mitosis Power Point Quiz

Interphase

Prophase

Metaphase

Anaphase

cytokinesis

Chromosomes align along the middle

Spindle fibers form

Nuclear envelope appears

Chromosomes appear

Chromosomes uncoil

Chromosomes move to opposite poles

Growth and preparation for division

Centromeres divide