. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. Figure6. A young hydra just as it emerged from the embryo (Bnen. 1965). Figure 7. Result of Browne's experiment in which she grafted, as donor, a piece of the hypostome and a tentacle taken from a "green" hydra whose algae had been removed, to the flank of a green hydra that still contained its endosymbiotic algae. The transplant induced a pig- mented secondary axis of polarity in the host. The figure is that of Browne. 1909. ferentiation of the grafted ; That is to say, only the hypostomal tissue had
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. Figure6. A young hydra just as it emerged from the embryo (Bnen. 1965). Figure 7. Result of Browne's experiment in which she grafted, as donor, a piece of the hypostome and a tentacle taken from a "green" hydra whose algae had been removed, to the flank of a green hydra that still contained its endosymbiotic algae. The transplant induced a pig- mented secondary axis of polarity in the host. The figure is that of Browne. 1909. ferentiation of the grafted ; That is to say, only the hypostomal tissue had this organizing capacity, not other tissues of hydra, such as a tentacle. Since the pub- lication of Browne's paper (1909), a number of other in- vestigators have used her findings in their experiments describing the developmental capacities of hydra tissues ( Yao. 1945; Webster and Wolpert, 1966). Was Either Spemann or Mangold Aware of Browne's Experiments Before Beginning Theirs? The close analogies between the experiments of Browne (1909) and the Nobel Prize experiments of Spemann and Mangold (1924) are manifest. Both papers showed that tissue taken from specific regions of an organism or em- bryo, when transplanted, could organize the adjoining host tissue and induce it to form a secondary axis of polarity that is similar, in most respects, to the primary axis of polarity. But more importantly, through the use of pig- mented and nonpigmented tissues, both sets of experi- ments proved conclusively that a true organization oc- curred, and not a growth and reorganization of the trans- planted tissues. Browne's experiment was even more conclusive because she used pigmented and nonpig- mented tissues from organisms of the same Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marine Biological L
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
