In other species which possess receptacula seminis it is probable that fertilization is effected once only in early life before any ova pass into the uterus. { bidder: 'sovrn', params: { tagid: '387233' }}, Published by Houghton Mifflin Harcourt Publishing Company. { bidder: 'pubmatic', params: { publisherId: '158679', adSlot: 'cdo_topslot' }}]}, iasLog("criterion : cdo_ptl = entryex-mcp"); { bidder: 'openx', params: { unit: '539971080', delDomain: 'idm-d.openx.net' }}, Fertilization. { bidder: 'sovrn', params: { tagid: '346688' }}, "noPingback": true, More from Merriam-Webster on fertilization, Nglish: Translation of fertilization for Spanish Speakers, Britannica.com: Encyclopedia article about fertilization.

{ bidder: 'onemobile', params: { dcn: '8a969411017171829a5c82bb4deb000b', pos: 'cdo_leftslot_160x600' }}, Differential methylation of DNA sequences associated with imprinted genes is thought to control genomic imprinting, which occurs soon after fertilization. addPrebidAdUnits(pbAdUnits); { bidder: 'triplelift', params: { inventoryCode: 'Cambridge_MidArticle' }},

{ bidder: 'ix', params: { siteId: '194852', size: [300, 250] }}, { bidder: 'openx', params: { unit: '539971081', delDomain: 'idm-d.openx.net' }}, Doncaster (1906-1907) on the eggs of sawflies, the number of chromosomes is not reduced in parthenogenetic egg-nuclei, while, in eggs capable of fertilization, the usual reduction-divisions occur. googletag.pubads().setTargeting("cdo_dc", "english"); { bidder: 'ix', params: { siteId: '195467', size: [320, 50] }}, bids: [{ bidder: 'rubicon', params: { accountId: '17282', siteId: '162036', zoneId: '776156', position: 'atf' }}, params: { When a few letters make a large difference. } initAdSlotRefresher(); { bidder: 'criteo', params: { networkId: 7100, publisherSubId: 'cdo_rightslot2' }}, type: "html5", { bidder: 'triplelift', params: { inventoryCode: 'Cambridge_MidArticle' }}, { bidder: 'onemobile', params: { dcn: '8a9690ab01717182962182bb50ce0007', pos: 'cdo_topslot_mobile_flex' }}, googletag.pubads().set("page_url", "https://dictionary.cambridge.org/dictionary/english/cross-fertilization"); enableSendAllBids: false, Browse our dictionary apps today and ensure you are never again lost for words. { bidder: 'appnexus', params: { placementId: '11654157' }}, "authorizationTimeout": 10000 googletag.pubads().setTargeting("cdo_l", "en-us"); var dfpSlots = {}; { bidder: 'openx', params: { unit: '539971080', delDomain: 'idm-d.openx.net' }}, The union of male and female gametes to form a zygote, a process that begins with the penetration of the secondary oocyte by the spermatozoon and is completed with the fusion of the male and female pronuclei.
What Is The Difference Between “It’s” And “Its”? No process of fertilization has as yet been observed. expressive of or characterized by sorrow. type: "html5", 'increment': 0.01, For example, the timing of the egg meeting the sperm has to be almost perfect for fertilization to occur. the enrichment of soil, as for the production of crops. In relation to the view that the spermatia are sexual cells, or at least were primitively so, it must be pointed out that although the actual fusion of the spermatial nucleus with a female nucleus has not been observed, yet in a few cases the spermatia have been seen to fuse with a projecting portion (trichogyne) of the ascogonium, as in Collema and Physcia, and there is very strong circumstantial evidence that fertilization takes place (see later in section on development of ascocarp).

{ bidder: 'sovrn', params: { tagid: '346693' }}, The word usage examples above have been gathered from various sources to reflect current and historial usage. { bidder: 'sovrn', params: { tagid: '446382' }}, "sign-in": "https://dictionary.cambridge.org/us/auth/signin?rid=READER_ID",

dfpSlots['topslot_a'] = googletag.defineSlot('/2863368/topslot', [], 'ad_topslot_a').defineSizeMapping(mapping_topslot_a).setTargeting('sri', '0').setTargeting('vp', 'top').setTargeting('hp', 'center').setTargeting('ad_group', Adomik.randomAdGroup()).addService(googletag.pubads()); For fertilization to occur, a sperm must penetrate the tough outer membrane of the egg called the zona pellucida. params: { { bidder: 'criteo', params: { networkId: 7100, publisherSubId: 'cdo_rightslot' }}, userSync: { having or characterized by persistent or earnest desire. These examples are from the Cambridge English Corpus and from sources on the web. The object of these movements will be appreciated when it is remembered that, if the pollen-masses retained the original direction they had in the anther in which they were formed, they would, when transported by the insect to another flower, merely come in contact with the anther of that flower, where of course they would be of no use; but, owing to the divergences and flexions above alluded to, the pollen-masses come to be so placed that, when transplanted to another flower of the same species, they come in contact with the stigma and so effect the fertilization of that flower. storage: { { bidder: 'sovrn', params: { tagid: '346688' }}, If, on the other hand, the endosperm is the product of an act of fertilization as definite as that giving rise to the embryo itself, we have to recognize that twin-plants are produced within the embryo-sac - one, the embryo, which becomes the angiospermous plant, the other, the endosperm, a short-lived, undifferentiated nurse to assist in the nutrition of the former, even as the subsidiary embryos in a pluri-embryonic Gymnosperm may facilitate the nutrition of the dominant one.

{ bidder: 'appnexus', params: { placementId: '11654157' }}, dfpSlots['topslot_a'] = googletag.defineSlot('/2863368/topslot', [], 'ad_topslot_a').defineSizeMapping(mapping_topslot_a).setTargeting('sri', '0').setTargeting('vp', 'top').setTargeting('hp', 'center').setTargeting('ad_group', Adomik.randomAdGroup()).addService(googletag.pubads()); An even greater rise following that can indicate fertilization has taken place. { bidder: 'criteo', params: { networkId: 7100, publisherSubId: 'cdo_btmslot' }},

When this attachment takes place by an articulation, the petals fall off either immediately after expansion (caducous) or after fertilization (deciduous).
googletag.pubads().setTargeting('ad_h', Adomik.hour); This will let you know what varieties to plant together to aid fertilization and pollination, along with specific growing conditions. { bidder: 'criteo', params: { networkId: 7100, publisherSubId: 'cdo_btmslot' }},

{ bidder: 'criteo', params: { networkId: 7100, publisherSubId: 'cdo_rightslot' }}, iasLog("criterion : cdo_ei = cross-fertilization"); type: "cookie", { bidder: 'triplelift', params: { inventoryCode: 'Cambridge_HDX' }}, pbjs.que = pbjs.que || []; { bidder: 'onemobile', params: { dcn: '8a969411017171829a5c82bb4deb000b', pos: 'cdo_topslot_728x90' }}, Please tell us where you read or heard it (including the quote, if possible). "sign-up": "https://dictionary.cambridge.org/auth/signup?rid=READER_ID",