Meiosis Rafael Achury

Meiosis is a type of cell division that reduces the number of chromosomes in the parent cell by half and produces four gamete cells. This process is required to produce egg and sperm cells for sexual reproduction.

The First Step in Meiosis is Interphase 1

Interphase 1:

G1 phase: The period prior to the synthesis of DNA. In this phase, the cell increases in mass in preparation for cell division.

S phase: The period during which DNA is synthesized. In most cells, there is a small amount of time during which DNA is synthesized.

G2 phase: The period after DNA synthesis has occurred but prior to the start of prophase. The cell synthesizes proteins and continues to increase in size.

The second step in Meiosis is Prophase 1

Prophase 1: In this step Chromosomes condense and attach to the nuclear envelope. Genetic recombination occurs. Chromosomes thicken and detach from the nuclear envelope. Similar to mitosis, the centrioles migrate away from one another and both the nuclear envelope and nucleoli break down.

The Third step in Meiosis is Metaphase 1

Metaphase 1: In metaphase I of meiosis, Tetrads align at the metaphase plate. At the end of metaphase I of meiosis, the cell enters into anaphase I.

The Fourth Step in Meiosis is Anaphase 1

Anaphase 1: In anaphase I of meiosis, Chromosomes move to the opposite cell poles. Similar to mitosis, microtubules interact to pull the chromosomes to the cell poles.Unlike in mitosis, sister chromatids remain together after the homologous chromosomes move to opposite poles. At the end of anaphase I of meiosis, the cell enters into telophase I.

The next step is Telophase 1 and Cytokinesis

Telophase 1: during this stage, there is a complete haploid set of chromosomes (but each chromosome still has two sister chromatids). A cleavage furrow appears, and by the end of this stage the parent cell has divided into two daughter cells.

Cleavage Furrow: Is the indentation of the cell's surface that begins the progression of cleavage, the final splitting of the membrane, in the process of cell division.

Meiosis

In Meiosis these stages occur twice beginning with Interphase 1 then going to Prophase 1, Metaphase 1, Anaphase 1 and lastly Telophase 1. This process happens again but instead have the numbers two after them. The final result of Meiosis is the production of four daughter cells. These cells have one half the number of chromosomes as the original cell. This process occurs in sex cells Other cell types are produced by mitosis. When sex cells unite during fertilization, these haploid cells become a diploid cell. Diploid cells have the full complement of homologous chromosomes.

Four daughter cells created in Meiosis

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