mitosis v meiosis

stages of mitosis

prophase, prometaphase, metaphase, anaphase, telophase

prophase

chromosomes condense, nuclear envelope breaks, spindle fiber starts to form

prometaphase

spindle fibers interact w/ sister chromatids (spindle apparatus forms) moving them towards the center

metaphase

duplicated sister chromosomes align along the middle, each pair of chromatids is attached to both poles by kinetochore microtubules

anaphase

sister chromatids move towards opposite sides

telophase

nuclear membrane reforms to form two separate nuclei

cytokinesis

divides the mother cell into two daughter cells (animals; cleavage furrow) (plants; cell plate)

S phase (interphase)

Chromosomes are replicated, two copies of a replicated chromosome (chromatid) are joined at centromeres to form sister chromatids

meiosis I

separate homologus chromosomes

Meiosis I : Prophase I

Homologous chromosomes pair up (synapsis), and crossing over occurs (creates genetic variation)

meiosis I : metaphase I

Homologous chromosome pairs line up in the middle with random assortment (independent assortment)

Meiosis I : Anaphase I

Homologous chromosomes separate, sister chromatids stay together

meosis I : telophase I

cell divides producing two haploid cells

meosis II

separate sister chromatids

meosis II : prophase

spindle forms and chromosomes condense

Meosis II : metaphase

chromosomes line up individually in the middle

Meosis II : anaphase

sister chromatids separate

Meosis II : telophase

nucli form and cell divides, producing 4 genetically different haploid cells