The condition that is caused is a trisomy or a monosomy
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Fertilization of the egg by the sperm. The resulting cell is a zygote, which contains the same number of chromosomes as a normal body cell for that species. For example, in humans, sperm cells have 1 set of 23 chromosomes, as do egg cells. So when they unite in fertilization, the zygote will have 2 sets of 23 chromosomes, for a total of 46.
Mendel's laws and meiosis provide the foundation for heredity.
Telophase occur in both mitosis and meiosis. During telophase nuclear membrane and nuclei reforms and in meiosis it further goes for meiosis 2 which is same as mitosis
The Roman numeral I is used to sub-head prophase of meiosis to indicate that it is the first stage of meiosis. Meiosis is a two-step cell division process that consists of meiosis I and meiosis II. By using Roman numerals, the sub-headings help to clearly distinguish between the two stages and show the sequential order in which they occur.