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.
Meiosis is the process of cell division leading to the production of gametes. A diploid parent cell divides into four haploid daughter cells. Fertilization. Fertilization of a haploid sperm cell with a haploid ovum produces a diploid zygote (fertilized egg). In humans, the egg and sperm each have a haploid number of 23 chromosomes. When a sperm fertilizes an egg, the resulting diploid zygote has 46 chromosomes (two sets of 23 chromosomes).