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 are produced by meiosis. During meiosis, the chromosome number is halved from the diploid number to the haploid number. Similar to mitosis, in meiosis also, DNA replication takes place in the parent cell during the interphase. After this, two cycles of nuclear divisions and cell divisions take place.ince each gamete has only one set of chromosomes, the end resulting zygote will have only two sets of chromosomes. That is the zygote becomes diploid. If the gametes were not haploid cells, the result at the end would be a zygote with four sets of chromosomes.