Meiosis Flashcards

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1
Q

Meiosis

A

The process of cell division that occurs IN the sex organs and PRODUCES the sex cells/gametes

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2
Q

Interphase 1

A

DNA is replicated creating two identical chromatids which are joined at the centromere.
Nuclear membrane disappears

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3
Q

Prophase 1

A

Chromosome have shortened and thickened becoming clearly visible. Pairs of homologous chromosomes line up next to each other. Crossing over occurs.

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4
Q

Meiosis 2

A

The second stage of Meiosis. No Interphase of Prophase stages occur.

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5
Q

Crossing Over

A

Parts of the chromosome of non-sister chromatids exchange pieces of information (and therefore alleles). Linked alleles are separated, the point at which they cross over is a CHIASMA

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6
Q

Chiasma

A

The point at where alleles on non-sister chromatids exchange

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7
Q

Metaphase 1

A

Homologous chromosomes (tetrads) arrange themselves randomly along the cell equator (Independent assortment). Spindle fibres begin pulling the homologous chromosomes apart.

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8
Q

Anaphase 1

A

The homologous pairs separate and move towards the cell poles.

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9
Q

Telophase 1

A

Two new daughter cells form. Each one is genetically unique.

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10
Q

Metaphase 2

A

Chromosomes line up again in the cell equator of each cell

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11
Q

Metaphase 2

A

Chromosomes line up again in the cell equator of each cell. Spindle fibres form. Independent assortment occurs.

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12
Q

Anaphase 2

A

Chromatids separate and move towards the cell poles.

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13
Q

Telophase 2

A

Cytokinesis occurs. Four new haploid daughter cells are formed. Each of them has a different genetic makeup from the other. The cells are gametes.

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