Phases Of Meiosis

Front 1

Prophase 1:

Back 1

Chromosomes form and each chromosome pairs with its homologous chromosome; called a tetrad – four chromatids
In a tetrad, homologous chromosomes can exchange portions of their chromatids; called crossing-over
Occurs at the chiasma
Creates recombinant chromatids (“recombined”)
Provides genetic variation – that’s how each one of us is very different from the other
Sexual reproduction creates genetic variation

Front 2

Metaphase 1:

Back 2

Tetrads line up in the middle, equatorial plane, of the cell

Front 3

Anaphase 1:

Back 3

Tetrads line up in the middle, equatorial plane, of the cell

Front 4

Telophase and Cytokineses 1:

Back 4

Nuclear envelope forms
Cytokinesis occurs resulting in two daughter cells
Daughter cells are NOT identical due to crossing-over in prophase I

Front 5

Prophase 2:

Back 5

Chromosomes form
Nuclear envelope disappears

Front 6

Metaphase 2:

Back 6

Chromosomes line up in the middle of the cell at the equatorial plate

Front 7

Anaphase 2:

Back 7

Sister chromatids separate and move away from each other to opposite poles of the cell

Front 8

Telophase and Cytokineses 2:

Back 8

Nuclear envelope forms
Cytokinesis occurs resulting in four genetically different gametes