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...Contents fertilization definition and types events of in sea urchin fig recognition egg by sperm mouse contact with chemotaxix acrosomal interaction membranes digestion jelly layer species specific urchins gamete binding mammals formation cone reactions prevention polyspermy the zygote biochemical changes during summary acknowledgements is process which male female gametes are fused together initiating development a new organism animals can occur either internally or externally difference largely determined method birth use viviparous ovoviviparous reproduction embryos develop within animal s body oviparous lay hard shelled eggs internal though produce that lacking have thin reproduce external reproductive strategy involving joining outside spawning event where from both sexes rapidly released into an aquatic environment may when laid on substrate subsequently fertilized ovum same approach come each other entry initiates further haploid nuclei fuse resulting diploid nucleus this nuclea...