Meiosis Animation

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Meiosis Animation

Meiosis Animation
Animation courtesy of Sea Urchin Embryology. Used with permission. © Chris Patton
Meiosis is a two part (meiosis I and meiosis II) cell division process in organisms that sexually reproduce. Through a sequence of steps, the replicated genetic material in a parent cell is distributed among four daughter cells. Each of the resulting daughter cells has one half of the number of chromosomes as the parent cell.

Meiosis Animation: Meiosis I vs. Mitosis

The animation above compares different phases of mitosis and meiosis I. The animation starts from metaphase of mitosis and metaphase I of meiosis I.

Mitosis: The animation shows the sister chromatids of homologous chromosomes separating and moving to opposite ends (poles) of the cell. Spindle fibers lengthen and elongate the cell. The chromosomes are cordoned off into distinct new nuclei (plural form of nucleus) in the emerging daughter cells. The replicated genetic material from the parent cell is equally distributed between two daughter cells. The resulting cells have the same number of chromosomes as the parent cell. Each chromosome consists of one chromatid.

Meiosis: The animation shows homologous chromosomes separating and moving to opposite poles of the cell. The sister chromatids however, remain together. Spindle fibers lengthen and elongate the cell. The chromosomes are cordoned off into distinct new nuclei. At the end of meiosis I, two daughter cells are produced, each with one half the number of chromosomes as the original parent cell. Each chromosome consists of two chromatids.

At the end of meiosis I, the cells enter the second part of the meiotic process, meiosis II.

02
of 02

Meiosis Animation

Meiosis Animation
Animation courtesy of Sea Urchin Embryology. Used with permission. © Chris Patton

Meiosis II is the second part of the meiotic process. Much of meiosis II is similar to mitosis and meiosis I. The chromosomes however do not replicate any further in this phase of meiosis. At the end of meiosis II, four daughter cells are produced, each with one half the number of chromosomes as the original parent cell.

Meiosis Animation: Meiosis II

The animation shows homologous chromosomes migrating to the metaphase II plate. Sister chromatids separate and move toward opposite cell poles. Spindle fibers lengthen and elongate the cell. Distinct nuclei form at the opposite poles, cytokinesis (division of the cytoplasm) occurs and four daughter cells are produced.