Meiosis By: Eric latham

It precedes the formation of gametes (sperm and egg) or spores (Fungi, plants and protists)

Meiosis is the basis of Sexual Reproduction

Meiosis is a type of cell division that reduces the number of chromosomes in the parent cell by half. Meiosis begins with a diploid parent cell. The parent cell goes through a round of DNA replication and then two separate cycles of nuclear division. The result of this is four daughter cells that are haploid. Haploid cells contain half of the chromosomes that the diploid has.

Meiosis I

The two nuclear divisions are called Meiosis I and Meiosis II. In some cells, Meiosis II occurs right after Meiosis I and is other cells, protein synthesis comes between the two nuclear divisions. During Meiosis I, the duplicated chromosomes align with their homologous partners then the homologous chromosomes are pulled away from each other and then separated into two different nuclei. This is when the chromosome number is reduced. Each nuclei has a copy of each chromosome which makes it haploid. The chromosomes are still duplicated.

Meiosis II

In Meiosis II, the sister chromatids are pulled apart, and each one becomes an individual, unduplicated Chromosome. The chromosomes are sorted into four new nuclei. Each new nucleus still has one cope of each chromosomes so it is haploid.

Chromosome number is restored after fertilization

Haploid gametes form by meiosis. The diploid chromosome number is restored at fertilization, when two haploid gametes fuse to form a zygote, the first cell of a new individual. Thus, meiosis halves the chromosome number, and fertilization restores it.

The End

Credits:

Created with images by quapan - "Human gametes: ovum & spermatozoon. Approximately 50% of the floating sperms contain the y-chromosome (--> fertilization leads to a male ♂ child), the other 50% encompass the x-chromosome (--> conception pruduces a female ♀ child)" • fdecomite - "Meiosis" • GreenFlames09 - "Meiosis 1" • tachyondecay - "Awesome handmade present" • gags9999 - "The winner!" • jurvetson - "Ocular Meiosis"

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