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Cell Division and Reproduction

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A series of free High School Biology Video Lessons.
The different steps in meiosis, The description of gametes, The description of karyotype.

Meiosis is a type of cell division that produces gametes. In meiosis, cells undergo two divisions. The result ofmeiosis is the production of four haploid cells from a diploid cell with each haploid cell contains half of the number of chromosomes and half of the genetic materials of a diploid cell. Meiosis has many similar mechanisms to mitosis. The stages of meiosis include prophase I, metaphase I, anaphase I and telophase I followed by prophase II metaphase II, anaphase II and telophase II.
The different steps in meiosis.
Asexual Reproduction
Asexual reproduction is a type of reproduction found mostly in prokaryotes. Asexual reproduction doesn't require fertilization and only one parent cell is needed to reproduce. In achaea and bacteria, the type of cell division that is involved in asexual reproduction is known as binary fission.
Understanding asexual reproduction.

Gametes are haploid cells that carry reproductive functions produced through meiosis. Gametes carried by males are called sperms and gametes carried by females are called eggs. By joining during fertilization, gametes form a zygote, which is a diploid.
The description of gametes.
Karyotypes are images which depict individual chromosomes. Karyotes are used by scientists to study chromosomal regulation and evolutionary events in living things. Scientists are able to study the number and appearance of the chromosomes. Through karyotypes, it is often possible to see genetic disorders such as Down's Syndrome simply by looking at a karyotype.
The description of karyotype.


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