How are sex cells formed

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When the body produces sex cells, like sperm or eggs, there are 46 chromosomes present, but since the sex cell will merge with its counterpart, only 23 are needed. During interphase, microtubules extend from these centrosomes. Sex cells are produced from special body cells that contain the entire genome. The centrioles are now at opposites poles in each of the daughter cells. Humans have 23 pairs of chromosomes. Meiosis can be divided into nine stages.

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A fertilized egg must therefore contain this same number and arrangement.

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What is meiosis?

This is important because male and female sex cells ultimately join to become a fertilized egg, which gives rise to a new organism, or offspring. In animals and plants fungi are somewhat different in this regard there are two types of sex cells: Outside of the nucleus are two centrosomes, each containing a pair of centrioles, these structures are critical for the process of cell division. In an elegant process called meiosis, each sex cell receives one member of each chromosome pair—23 total. Therefore, each sperm or egg that the body produces is unique -- it contains a different mix of the mother's and father's genes. Illustration showing the nine stages of meiosis. DNA or deoxyribonucleic acid is a long molecule that contains our unique genetic code.

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