What is meiosis?
A type of cell division that results in two daughter cells, each with half the chromosome number of their parent cell.
Prophase 1
-chromosomes coil up and a spindle forms
-homologous chromosomes come together matched gene by gene forming a tetrad
-Crossing Over may occur when chromatids exchange genetic material
-this occurs two or three times per pair of homologous chromosomes
-Crossing Over results in new combinations of alleles on a chromosomes
-homologous chromosomes come together matched gene by gene forming a tetrad
-Crossing Over may occur when chromatids exchange genetic material
-this occurs two or three times per pair of homologous chromosomes
-Crossing Over results in new combinations of alleles on a chromosomes
Metaphase 1
-the centromere of each chromosome becomes attached to a spindle fiber
-the spindle fibers pull the tetrads to the equator of the spindle
-homologous chromosomes are lined up side by side as tetrads
-the spindle fibers pull the tetrads to the equator of the spindle
-homologous chromosomes are lined up side by side as tetrads
Anaphase 1
-homologous chromosomes separate and move to opposite ends of the cell
-centromeres do not split
-this ensures that each new cell will receive only one chromosome from each homologous pair
-centromeres do not split
-this ensures that each new cell will receive only one chromosome from each homologous pair
Telophase 1
-the spindle breaks down and the chromosomes uncoil
-the cytoplasm divides to yield two new cells
-each cell has half the genetic information of the original cell because it has only one homo
- logous chromosome from each pair
-the cytoplasm divides to yield two new cells
-each cell has half the genetic information of the original cell because it has only one homo
- logous chromosome from each pair
Prophase 2
-a spindle forms in each of the two new cells and the fibers attach to the chromosomes
Metaphase 2
-the chromosomes are pulled to the center of the cell and line up randomly at the equator
Anaphase 2
-the centromere of each chromosome splits
-the sister chromatids separate and move to opposite poles
-the sister chromatids separate and move to opposite poles
Telophase 2
-nuclei re-form
-the spindles break down
-the cytoplasm divides -identical to mitosis
-the spindles break down
-the cytoplasm divides -identical to mitosis