significance of fertilization 1)a new life begin (initiation of cleavage) 2)restoration of the diploid number of chromosomes: cross-over 3)determination of the sex of the new individual e ova (22+X)+ X-bearing spermatozoon girl e ova (22+X)+ Y-bearing spermatozoon boy *klinefelter's syndrome: 47XXY, 48XXXY---significance of fertilization: 1) a new life begin(initiation of cleavage) 2)restoration of the diploid number of chromosomes: cross-over 3) determination of the sex of the new individual: ova(22+X) + X-bearing spermatozoon = girl ova(22+X) + Y-bearing spermatozoon = boy *klinefelter’s syndrome: 47XXY, 48XXXY