In the C and C++ programming languages, #pragma once is a non-standard but widely supported preprocessor directive designed to cause the current source file to be included only once in a single compilation.
During sexual reproduction, fertilization of the ovum (n, 23 chromosomes) by the sperm (n, 23 chromosomes) restores the diploid number and creates a zygote (2n, 46) (awww..) that divides and grows by mitosis to form a multicellular human.
Yes, they do. During fertilization, the nucleus of the sperm and ova fuse to form a complete cell. Remember, the chromosome number in a sperm cell or ovum is half the normal n â¦ umber, or haploid.11 people found this useful.he sperm nucleus (in animals) contains the haploid chromosome set of the parent father. The egg or ovum carries the other half of the chromosome set from the parent mother. O â¦ n fertilisation the two sets fuse and a full set of chromosomes forms (diploid).