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.
It is meiosis that produces haploid cells, the process being reÂ­stricted to the reproductive tissues (i.e., ovaries and testes). During meiosis, the replicated chromosomes of the nucleus are apportioned among four daughter nuclei, each nucleus acquiring half the number of chromoÂ­somes of a diploid cell.