Web-Fertilization can occur anywhere in the animal hemisphere of amphibian embryo (must enter animal pole)-Sperm is 1st thing to dictate organization of frog-Sperm entry determines ventral side; 180' opposite is future dorsal-Sperm organizes microtubules of the egg, anchor yolk and allow clear cortical cytoplasm to rotate creating the gray crescent, site of … WebA. it lifts away from the egg and hardens to form a fertilization envelope. B. it secretes hormones that enhance steroidogenesis by the ovary. C. it reduces the loss of water from the egg and prevents desiccation. D. it provides most of the nutrients used by the zygote. A.

Frog development examples (article) Khan Academy

WebThe previously reported ability of grafts of grey crescent cortex to induce secondary axes in recipient eggs is interpreted here as an unrecognized twinning effect of gravity. Our … WebIn the zygote of the frog, there are two poles present. The vegetal pole and the animal pole. These are separated by an area which is rich in melanin and is known as the … 黒い砂漠 dボーナス

Grey crescent is the area Biology Questions - Toppr Ask

Webgray crescent A cortical region of the newly fertilised egg of frogs and some salamanders that forms just after fertilization on the side opposite sperm penetration. Tags: Webgrey crescentとは意味: 灰色新月環｛はいいろ しんげつ かん｝…. 詳しい日本語の意味はこちら ... 《英》 ＝→→gray./// crescent crescent 彎月 わんげつ クレッセント ; WebMar 29, 2024 · Grey crescent is the area 黒い砂漠 fg