Sperm tail structure

Citing articles via Web of Science Retrieved Photo courtesy of S. The homologous chromosomes…. In the spermatid stage, the sperm develops the familiar tail. The head of the sperm varies in shape for each animal species.

By using cryo-electron tomography, researchers at the University of Gothenburg -- working in partnership with researchers in the United States -- have identified a completely new nanostructure inside sperm tails. Answer Now. The type of the sperm produced varies from species to species. Its shape, size and structure vary greatly in different groups of vertebrates Fig. Answer Now and help others. This renders sexual reproduction in the absence of water impossible, since water is a necessary medium for sperm and egg to meet.

Biology of Reproduction. Journal of Forensic Sciences. The distal Centriole forms and gives attachment to the axial filament of the sperm tail; the proximal Centriole has no active function in the spermatozoon but is a potential activist within an egg during first cleavge division of the fertilized egg. The cytoplasm in between the membrane of acrosomal vesicle and sperm plasma membrane is called periacrosomal cytoplasm. Before the tube reaches the ovule , the nucleus of the generative cell in the pollen grain divides and gives rise to two sperm nuclei, which are then discharged through the tube into the ovule for fertilization.