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The annulus is composed of the closely packed filamentous subunits, 3 to 4 nm in diameter. The different sections of this article have been assembled into the following table of contents. The axoneme consists of two singlet microtubules surrounded by nine microtubule more One of the four deep i. Internet URLs are the best. The stages of spermatogenesis.
Molecular Biology nucleus of a sperm the Cell. In most species, there are nucleus of a sperm two types of gameteand they are radically different. The egg is among the largest cells in an organism, while the sperm spermatozoonplural spermatozoa is often the smallest. The egg and the sperm are optimized in opposite ways for the propagation of the genes they carry. The egg is nonmotile and aids the survival of the maternal genes by providing large stocks of raw materials for growth and developmenttogether with an effective protective wrapping.