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Meiosis

The 8 stages of Meiosis and crossing over
by

Miss Schwinge

on 8 January 2014

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Transcript of Meiosis

Meiosis!
Each chromosome pairs with its corresponding homologous chromosome to form a tetrad (total of 4 chromatids)
Prophase I
Spindle fibers attach to the chromosomes, and the tetrads line up along the center of the cell
Metaphase I
The homologous chromosomes separate, but the sister chromatids are still attached
Anaphase I
Nuclear membranes form, and the cell separates into two daughter cells
Telophase I
and Cytokinesis
In the two new daughter cells, centrioles form and move toward the poles while the nuclear membrane dissolves
Prophase II
Telophase II
and Cytokinesis
A type of cell division in sexually reproducing organisms that results in four genetically different haploid cells, each with half the chromosome number of the parent cell.

Diploid --> Haploid
Interphase
Cells grow and undergo a round of DNA replication, forming duplicate chromosomes
Like prophase in Mitosis, the chromosomes condense and become visible, the centrioles form and move toward the poles, and the nuclear membrane begins to dissolve
The centromeres break and sister chromatids separate
Anaphase II
Microtubules attach to the centromeres, and the sister chromatids line up along the cell equator
Metaphase II
The chromosomes may decondense
(depends on species)
, and the end result is four genetically different haploid daughter cells
Crossing Over
Crossing over is
what made you not exactly like your mom or your dad, or anyone else in your family.
It is how your parents'
genetic information
got scrambled before the
sperm
and the
egg
that made you were
formed.
Crossing over is the exchange of alleles between homologous pairs of chromosomes during prophase I of meiosis.
In the very beginning of meiosis,
replicated sister chromatid find their homologous chromosomes
When they have
found each other
, the
chromosomes
line up at the
center
of the
cell
and quite often
bump into each other.
Because these chromosomes are not held together very tightly, they can often become
knocked apart at the point where the two chromosomes have hit together.
The
pieces
that have
broken off
will attach to other
homologous chromosome.
Crossing over
also called
Genetic Recombination
because the
genes
are being
recombined
or
shuffled
around during this process
It is
genetic recombination
(
crossing over
) that made you the
unique human you are today!
Full transcript