Cell Reproduction Mitosis & Meiosis.

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Meiosis and Sexual Reproduction

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Cell Reproduction Mitosis & Meiosis

http://biotech-adventure. okstate http://biotech-adventure.okstate.edu/low/basics/mitosis/mitosis-diagram/diagram.gif

Cell Cycle http://www.bmb.psu.edu/courses/biotc489/notes/cycle.jpg

Sexual Reproduction Meiosis

Sexual Reproduction A type of reproduction in which two sex cells, usually an egg and a sperm, join to form a zygote, which will develop into a new organism with a unique identity.

Sexual reproduction results in a great variety, or diversity, of offspring.

Meiosis The nucleus divides twice Meiosis I Meiosis II

http://biotech-adventure.okstate.edu/low/basics/meiosis/diagram/

Interphase DNA is duplicated

Prophase I DNA shorten & thicken Forms chromatids / chromosomes

http://biotech-adventure. okstate http://biotech-adventure.okstate.edu/low/basics/meiosis/phases/prophase/leptotene/leptotene.gif

Metaphase I Copied chromatids / chromosomes line up in middle of cell Centromeres attach to spindle fibers

http://biotech-adventure. okstate http://biotech-adventure.okstate.edu/low/basics/meiosis/phases/metaphase-I/metaphase-I.gif

Anaphase I Chromatid pairs are pulled apart Move to ends of cell They DO NOT separate Move to ends of cell

http://biotech-adventure. okstate http://biotech-adventure.okstate.edu/low/basics/meiosis/phases/anaphase-I/anaphase-i.gif

Telophase I Cell divides No further replication of hereditary material

http://biotech-adventure. okstate http://biotech-adventure.okstate.edu/low/basics/meiosis/phases/telophase-I/telophase-I.gif

There are now two cells. Both cells have full sets of genetic material (chromosomes)

Prophase II Similar to mitosis Starts with TWO cells instead of one Spindle fibers appear

http://biotech-adventure. okstate http://biotech-adventure.okstate.edu/low/basics/meiosis/phases/prophase-II/prophase-II.gif

Metaphase II Duplicated chromatid / chromosomes line up in middle of cell Spindle fibers attach to centromeres

http://biotech-adventure. okstate http://biotech-adventure.okstate.edu/low/basics/meiosis/phases/metaphase-II/metaphase-II.gif

Anaphase II Centromere divides Chromatids separate & move to ends of cell Chromatids are now individual chromosomes

http://biotech-adventure. okstate http://biotech-adventure.okstate.edu/low/basics/meiosis/phases/anaphase-II/anaphase-II.gif

Telophase II Spindle fibers disappear Nuclear membranes form at each end of cell Cells divide Results in 4 cells Each with ½ the original number of chromosomes

http://biotech-adventure. okstate http://biotech-adventure.okstate.edu/low/basics/meiosis/phases/telophase-II/telophase-II.gif

Meiosis Animation http://www.johnkyrk.com/meiosis.html

In summary: Meiosis Two cells form during meiosis I In meiosis II, both of these cells form two cells The two divisions of the nucleus result in four sex cells (gametes) Each has one-half the number of chromosomes in its nucleus that was in the original nucleus