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.
1924: The Huff Daland Dusters crop-dusting operation, which formed the roots for Delta, founded in Macon, Ga. This was the first commercial agricultural flying company in existence. 1925: Huff Daland Duster's headquarters moves to Monroe, La. Huff Daland's 18 planes are the largest privately owned fleet in the world.959: Delta is first airline to launch Douglas DC-8 jet service. The red, white, and blue triangle widget becomes Delta's logo resembling the swept-wing appearance of a jet. 1960: First airline to launch Convair 880 jet service. 1961: Flies first nonstop service from Atlanta to Los Angeles.