Oogenesis
The formation of the ovum (mature female gamete) from undifferentiated germ cells is called oogenesis. This process takes place in the ovaries (female gonads). Oogenesis consists of three stages known as the multiplication phase, growth phase, and maturation phase.
Cell Division
Cell division involves the formation of new daughter cells from the parent cells. It is a part of the cell cycle that takes place in both prokaryotic and eukaryotic organisms. Cell division is required for three main reasons:
Nondisjunction a phenomenon that is more serious when taking place at meiosis one that meiosis two, explain?
Nondisjunction refers to failure of separation of chromosomes (in meiosis I) or chromatids (in meiosis II) during cell division.
A normal cell has a pair of homologous chromosomes. Meiosis I is reductional division in which the daughter nuclei receive one set of homologous chromosome. These nuclei undergo meiosis II which is equational division in which each daughter nuclei receives one chromatid each of homologous chromosome.
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