In organisms that reproduce sexually, the union of an ovum with a sperm results in a zygote, or fertilized egg, which undergoes a series of divisions called cleavages as it passes down the fallopian tube.
During the first growing season, the pollen tube grows slowly through the nucellus, while within the ovule the megaspore nucleus, through a series of divisions, gives rise to a collection of some 2,000 nuclei, which are then individually enclosed by walls to form a structure called the female gametophyte or prothallus.
In his commentary on the Categories, Boethius presented a series of divisions which he took from Greek authors.
In the recent years, there has been a series of divisions in employers' organisations (firms setting up alternative employers' organisations to be freed from the agreement's obligations, beyond the famous FIAT case).
Again, surely Zeno is aware of these facts, and so must have something else in mind, presumably the following: he assumes that if the infinite series of divisions he describes were repeated infinitely many times then a definite collection of parts would result.
After this series of divisions is complete the 2a, 2b, and 2c clones each number six cells, and 2d has formed seven.
DOI: http://dx.doi.org/10.7554/eLife.02224.001 After an egg has been fertilized, it undergoes a series of divisions to produce a ball of cells known as a blastocyst.
This daughter cell then moves into another niche called the 'differentiation' niche and undergoes a series of divisions that produce the egg cells.
Upon hatching, some cells undergo another series of divisions before the worm reaches its final adult total of 959 somatic cells.
