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Impregnation aus Wikipedia. Zum Beitrag

Fertilisation - Wikipedia, the free encyclopedia a.new,#quickbar a.new{color:#ba0000} /* cache key: enwiki:resourceloader:filter:minify-css:3:f2a9127573a22335c2a9102b208c73e7 */ Fertilisation From Wikipedia, the free encyclopedia   (Redirected from Impregnation) Jump to: , This article is about fertilisation in animals and plants. For fertilisation in humans specifically, see Human fertilization. A sperm cell fertilising an ovum For soil improvement see Fertiliser. "Conceive" redirects here. For the health magazine, see Conceive magazine. For philosophical abstraction, see concept. Fertilisation (also known as conception, fecundation and syngamy), is the fusion of gametes to produce a new organism. In animals, the process involves the fusion of an ovum with a sperm, which eventually leads to the development of an embryo. Depending on the animal species, the process can occur within the body of the female in internal fertilisation, or outside in the case of external fertilisation The entire process of development of new individuals is called procreation, the act of species reproduction.

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Fertilisation in plants

Flowering plants

After the carpel is pollinated, the pollen grain germinates in a response to a sugary fluid secreted by the mature stigma (mainly sucrose). From each pollen grain, a pollen tube grows out that attempts to travel to the ovary by creating a path through the female tissue. The vegetative (or tube) and generative nuclei of the pollen grain pass into its respective pollen tube. After the pollen grain adheres to the stigma of the carpel (female reproductive structure) a pollen tube grows and penetrates the ovule through a tiny pore called a micropyle. The pollen tube does not directly reach the ovary in a straight line. It travels near the skin of the With multi-seeded fruits, multiple grains of pollen are necessary for syngamy with each ovule. The growth of the pollen tube is controlled by the vegetative (or tube) cytoplasm. Hydr... mehr

Impregnation aus Wikipedia. Zum Beitrag