egrep (which is the same as grep -E) treats +, ?, |, (, and ) as meta-characters. In basic regular expressions (with grep), the meta-characters ?, +, {, |, (, and ) lose their special meaning. If you want grep to treat these characters as meta-characters, escape them \?, \+, \{, \|, \(, and \).
Plants, fungi, and some protists also perform meiosis. In plants, meiosis creates a multicellular haploid organism, called a gametophyte , which in some groups is independent of the diploid plant. Gametes are produced by mitosis of the gametophyte, which then fuse to form the embryo. This cycle is called alternation of generations. Meiosis involves two divisions.
Haploid cells have one complete set of chromosomes. Sex cells (sperm and eggs) are usually haploid. When two haploid cells fertilize each other, the resulting diploid cell can grow into a normal diploid embryo and ultimately to a full grown adult. Mitosis produces diploid cells and is called mitotic cell division. Meiosis produces haploid cells and is called meiotic cell division. The stages that describe the process of cell division are the same in both mitosis and meiosis. They are Prophase, Metaphase, Anaphase and Telophase. Mitosis and meiosis are part of a larger process called the cell cycle.