天气预报 > 其他 > 为什么要选蝌蚪做实验
为什么要选蝌蚪做实验
更新时间: 2020-09-22 00:00:00  

蝌蚪属于变态发育,周期短,体型变化较大,容易观察,昆虫不方便喂食甲状腺激素,哺乳类动物发育周期长,更好观察这种激素对其生长发育的影响。蝌蚪生长发育后,变态的时间受繁殖孵化季节和外界气温的影响极大,一般5到7月份产卵孵化的蝌蚪在7到9三个月中可以变态,8到9月份以后繁殖孵化的蝌蚪要经过越冬,到第二年4月份以后才能变态成幼蛙。

关键词: 为什么 蝌蚪 实验

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