Macrocystis and Nereocystis and is distinguished by its heteromorphic ALTERNATION OF GENERATIONS in which a large sporophyte alternates with a microscopic gametophyte, and in which growth takes place in a special meristem region on the surface of the thallus.

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Ananisogamy The sexual fusion of nonidentical gametes. Anisogamy grades from situations in which the gametes differ only in size to the extreme of oogamy, in which one gamete is a large nonmotile ovum and the other a small motile sperm.

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The smaller of a pair of conjugating gametes, usually the male, in an organism that reproduces by heterogamy.

小配子一對并合配子中較小的一個A片网页免费在线观看，通常是由異配產(chǎn)生的有機物中的雄性

Either of two conjugating gametes that differ in structure or behavior, such as the small, motile male spermatozoon and the larger, nonmotile female ovum.

異形配子在結(jié)構(gòu)或行為上不同的兩個配合配子之一先锋影音最新色资源在线观看，如小的能動的雄性精子與大的不能動的雌性卵子

Either of two conjugating gametes that differ in structure or behavior,such as the small, motile male spermatozoon and the larger,non motile female ovum.

異形配子在結(jié)構(gòu)或行為上不同的兩個配合配子之一，如小的能動的雄性精子與大的不能動的雌性卵子

Monosomic 3, monosomic 5, monosomic 10, trisomic 4 and trisomic 5 as experiment materials, their meiosis behavior of pollen mother cell, pollen characteristics, physiological and biochemical characteristics of anther, section observation of pollen development and the structure of embryo sac were studied, and the effects on the seed set and transmission rate were analyzed.

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It was the favourite wish of his mother, as well as of her's. While in their cradles, we planned the union: and now, at the moment when the wishes of both sisters would be accomplished in their marriage, to be prevented by a young woman of inferior birth, of no importance in the world, and wholly unallied to the family!

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Though the gametic nucleus of normal cell didn't enter the amicronucleate cell, there were cytoplasm and organelle exchanges between two cells.

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It is the first time that these phenomena were observed: Two nuclei are surrounded by plasma and locate at the central of the female gametophyte and the others nuclei are positioned at the fringe of the female gametophyte; Before the pollen tube enters the female gametophyte. the nuclei in chalazal end begin splitting of plasma and form multinuclear cell.4. The pollens of Gnetumc are spherical or applanate with single aperture. The ornamentation of exine is spine. The basis part of spine is lenience and the top part of spine is tip or obtuse sphere.

首次在買麻藤屬植物的雌配子體中觀察到2個游離核位于配子體的中央位置，且被一團原生質(zhì)所包圍的国产欧美日韩另类一区，其余的游離核位于邊緣的現(xiàn)象以及花粉管進入雌配子體前免费一级A片男女牲交无遮挡，合點端的核已經(jīng)發(fā)生胞質(zhì)分裂形成多核細胞的現(xiàn)象 4、買麻藤的花粉近球形或扁平型狼人狠狠干，有單萌發(fā)孔，外壁表面具小刺狀紋飾99这里有精彩视频，小刺基部寬大精品国产欧美在线观看不卡，末端尖或鈍圓。

Dendrocalamus sinicus ; reproductive organs ; megasporogenesis ; microsporogenesis ; male gametophyte ; female gametophyte

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