GARY 發問時間: 社會與文化語言 · 2 0 年前

翻譯的問題 = =

Two types of oogenesis have been observed among orders of the scyphozoan. In rhizostome and semaeostome species, the oocytes develop in close association with trophocytes, specialized gastrodermal cells that are though to have a nutritive function. In coronate species, oocytes develop freely within the mesoglea. Oocyte development in Catostylus mosaicus appeared to be consistent with those of other rhizostomes, with oocytes remaining connected to the gastrodermis via tropocytes throughout development.

Like most scyphozoans, Catostylus mosaicus is gonochoristic. The sex ratio did not differ from 1:1 over 8 sampling times within a period of 1 yr. Sex ratios of scyphozoans are known to vary between 1:1 and 1.7 females:1 male. The sex ratio may also vary according to time of year. For example, in the Niantic River Estuary, female Cyanea sp. medusae outlive males so, at certain times of the year, the population consists entirely of female medusae. Although there was some variation in the sex ratio of C. mosaicus among months, the pattern was not consistent between consecutive months and there was no evidence if temporal trends in the frequency distribution of the sexes.

The sex of some scyphozoans can be determined from the presence of brooding structures in the females, such at the brood pouches on the oral arms of Aurelia aurita or the brood-carrying filaments of Cotylorhiza tuberculata. The colour of the gonads has also been used to differentiate between the sexes of the semaeostome Dactylometra quinquecirrha, with male gonads being bright pink and female gonads grayish brown or yellowish brown. There were no distinctive brooding structures on Catostylus mosaicus, and the colour of the gonads was not consistent between sexes. Consequently, sexes could only be differentiated by microscopic examination of gametogenic tissue. There were differences in the sizes of male and female medusae. Trends were not consistent among times, however, suggesting that there is no sexual dimorphism in relation to size.

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  • 匿名使用者
    2 0 年前
    最佳解答

    兩類oogenesis已經被在scyphozoan的命令中遵守。 在rhizostome裡和semaeostome 種類,oocytes在密切的與trophocytes的合作過程中發展,專業化是雖然有一個有營養的功能的gastrodermal小屋。 在coronate 種類方面,oocytes在mesoglea內自由地發展。 在Catostylus mosaicus方面的Oocyte 發展看起來和其他rhizostomes的一致,oocytes保持透過tropocytes在整個發展期間連接gastrodermis。

    象大多數scyphozoans一樣,Catostylus mosaicus是gonochoristic。 性比率沒, 不同于8抽樣時間結束在的時間1年性scyphozoans的比率內變化,眾所周知的1︰1, 在之間1︰1 和1.7 雌性︰1男性。 年,性比率可能也根據調節變化。 例如, 在Niantic 河河口,女性Cyanea裡特別的medusae 如此渡過男性,在這一年的一定次,人口完全由女性medusae組成。 雖然在月中在C. mosaicus的性比率方面有一些變化, 圖案不始終如一在連續月之間並且沒有證據暫時趨勢在頻率性的分發內。

    一些scyphozoans的性可能根據孵架構在雌性內的存在決定, 這樣小袋關於奧裡莉亞aurita或者一窩傳播的Cotylorhiza tuberculata的細絲的口頭臂在一窩。 性腺的顏色也已經用來把semaeostome Dactylometra quinquecirrha的性區分開, 由於男性性腺作為淺灰色棕色或者淡黃棕色明亮的粉紅色和女性性腺。 在Catostylus mosaicus上沒有特別的孵的架構,並且性腺的顏色在性之間不一致。 從而,性只能差別在于gametogenic 織物的顯微組織檢查。 有男性和女性medusae的尺寸的差別。 趨勢在時代中不一致,不過,建議關於尺寸沒有性雙晶現象。

    參考資料: Dreye
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  • 匿名使用者
    2 0 年前

    二類型的 oogenesis 在 scyphozoan 的次序之中已經被觀察。 在 rhizostome 和 semaeostome 品種方面,卵母細胞在和 trophocytes 的接近協會中發展,特殊化雖然是有一個有營養的功能 gastrodermal 細胞。 在 coronate 品種方面,卵母細胞自由地在 mesoglea 裡面發展。被似乎對其他 rhizostomes 的感到一致的 Catostylus mosaicus 的卵母細胞發展,與保持的卵母細胞在發展各處經由 tropocytes 連接到 gastrodermis 。

    Lik

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