Viaspace Giant King Grass shows high yield at California site. Viaspace Inc. has announced that the first harvest of Giant King Grass in the Imperial Valley of California, was completed on Sept. 2. At the University of California site in Holtville, California, two planting methods were compared.
Identical Twins occur when a single egg is fertilized by a single sperm to form one zygote (monozygotic) but the zygote then divides into two separate embryos. The biological mechanisms that prompt the single fertilized egg to split in two remain a mystery. The two embryos develop into foetuses sharing the same womb.
So when one egg is fertilized by single sperm then identical twins or mono zygotic are born and they are always of same sex. But when two different eggs are fertilized by two different sperms then fraternal twins are born. In fraternal twins sex of both twin are irrespective of each other .