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Fertilisation or fertilization (see spelling differences), also known as generative fertilisation, insemination, pollination, fecundation, syngamy and impregnation, is the fusion of gametes to initiate the development of a new individual organism or offspring. This cycle of fertilisation and development of new individuals is called sexual reproduction. During double fertilisation in angiosperms the haploid male gamete combines with two haploid polar nuclei to form a triploid primary endosperm nucleus by the process of vegetative fertilisation

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Fusion of a male gamete with a female gamete to initiate development of a new zygote is termed as fertilization.Generally haploid gametes fuse to form a diploid zygote.

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the action or process of fertilizing an egg or a female animal or plant, involving the fusion of male and female gametes to form a zygote.

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 Fusion of male gamete or sperm with a female gamete or egg to produce a diploid zygote is called fertilization .It may be external as in fishes where it takes place in water or internal as in mammals where it takes place in side body of female .In human being and other higher mammals although only one sperm enters egg, but many sperms are needed to clear way for one sperm by digesting theca interna cells with help of acrosomal enzymes .

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Fertilization is the fusion of gametes to initiate the development of a new individual organism. In animals, the process involves the fusion of an ovum with a sperm, which first creates a zygote and then leads to the development of an embryo.

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Fertilization occurs when one sperm penetrates the egg, combining their genetic material.