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水螅是生活在溪水中的腔肠动物,是动物学教学中的代表动物之一.水螅有雌雄同体与雌雄异体两种类型,大部分种类为雌雄异体,只有少数水螅为雌雄同体。对于雌雄异体的水螅,它们的性别表型是由间质细胞决定的,还是由体壁细胞决定的呢?关于这个问题,美国加利福尼亚大学理查德·坎贝尔做了一个有趣的实验。坎贝尔做这个实验选用的水螅是雌雄异体的褐水螅(H·OLigactis)。他把雄性水螅和雌性水螅分别培养,使它们进行出芽生殖.实验前把它们产生的芽体再培养6周以上,以保证每个水螅个体大、出芽率高。从这些水螅中选出一部分制备“上皮水螅”,一部分用做供体水螅.实验主要分以下几步.
Minamata is a coelenterate living in stream water and is one of the representative animals in zoology teaching. Minamata dioecious and dioecious are two types, most of which are dioecious and only a few of which are hermaphrodite. For males and females, are their gender phenotypes determined by interstitial cells or by somatic cells? Richard Campbell of the University of California, California, made an interesting experiment on this issue. Campbell used to do this experiment is the ditch water dioecious (H · OLigactis). He males and females were cultured separately, so that they sprouting.Experiments before the bud they produce more than 6 weeks to ensure that each individual hydatid individuals, the high rate of budding. A selection of these hydra prepares “Epidermis hydra,” and a portion is used as a donor hydration. The experiment is divided into the following steps.