In human fertilization, two 1n haploid cellsâan ovum (female gamete) and a sperm cell (male gamete)âcombine to form a single 2n diploid cell called the zygote.NA is then replicated in the two separate pronuclei derived from the sperm and ovum, making the zygote's chromosome number temporarily 4n diploid. After approximately 30 hours, fusion of the pronuclei and subsequent mitotic division produce two 2n diploid daughter cells called blastomeres.
The Delta Force was secretly created in October 1977 by US Army Colonel Charles Beckwith in direct response to numerous, well-publicized terrorist incidents that occurred in the 1970s. From its beginnings, Delta Force was heavily influenced by the British Special Air Service.
A founding member of the SkyTeam airline alliance, Delta is headquarterd in Altlanta, Geaorgia, USA. One of the major airline operators in the US, Delta and its subsidiaries operate over 5,000 flights every day. Delta was founded in 1924, originally as a crop dusting operation in Macon, Georgia. From its small beginnings, Delta has grown into one of the largest airlines in North America.