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Meiosis Webquest

Page history last edited by Shelly Turner 11 years, 6 months ago

Understanding meiosis is very important.  There are several steps and it is an important process in the production of gametes.

 

Start studying mieosis here:

 

http://www.cellsalive.com/meiosis.htm

 

Events during Meiosis

Identify all of the steps as you watch the video:

 

Diploid Cell (2N): From a preceding mitotic division, the Oogonium (Spermatogonium) enters meiosis with DIPLOID (2N) chromosomes but TETRAPLOID (4N) DNA. Chromosomes then duplicate to produce SISTER CHROMATIDS (or HOMOLOGOUS DYADS).

 

Prophase I: Dyad pairs align to create "TETRADS", non-sister chromatids connect and trade sections at a "CHIASMA", a process called "CROSSING OVER".

 

Metaphase I: SPINDLE FIBERS attach to each dyad at the KINETOCHORE. Tension from spindle fibers aligns the tetrads at the cell equator.

 

Anaphase I: Chiasmata break apart and sister chromatids begin migrating toward opposite poles.

 

Telophase I: CLEAVAGE FURROW forms beginning the process of CYTOKINESIS (cell division). Resulting daughter cells are HAPLOID (1N).

 

Prophase II: Spindle formation begins and centrosomes begin moving toward poles.

 

Metaphase II: Tension from spindle fibers aligns chromosomes at the metaphase plate.

 

Anaphase II: CHROMATIDS separate and begin moving to the poles.

 

Telophase II: CLEAVAGE FURROW forms beginning CYTOKINESIS.

 

Gamete (1N): NUCLEAR ENVELOPES form and chromosomes disperse as CHROMATIN. Meiosis has produced 4 DAUGHTER CELLS, each with 1N chromosomes and 1N DNA. Later, in fertilization, male and female 1N gametes will fuse to form a 2N ZYGOTE.

 

http://www.emc.maricopa.edu/faculty/farabee/biobk/biobookmeiosis.html

Identify diploid and haploid and what it means.

 

Follow down to the stages of meiosis and watch how each step changes.

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