itle Bonus Question (2 pts): Hans Spemann\'s now classic experiment splitting fr

Question

itle Bonus Question (2 pts): Hans Spemann's now classic experiment splitting frog eggs from different angles was based on an even early experiment done by Hans Dreisch, using sea urchins. When Dreisch split early sea urchin embryos along the animal-vegetal axis (e-g. separating the Eastern from the Western hemisphere so to speak) he always got two well formed, though half-sized pluteus larvae-no matter which angle he sliced around the "globe" When Spemann performed the same experiment with frog embryos he found that so led to two well-formed, though half-sized frog larvae, similar.to what Dreisch had found..but other cuts led to one normal looking half-sized larvae and one mal-formed embryo possessing few differentiated tissues. What explains their different results? me cuts

Explanation / Answer

The major difference when it comes to both experiments is the body symmetry of both the organism. In case of sea urchin that was done by the Dreisch the body symmetry could be equally divided due to the axis or position which led to equal halves no matter from whichever side it was divided. However, when it comes to the Han Spemann’s splitting frog egg, during the developmental phase, the symmetry is not equal and both sides do not have equal needed components for forming proper embryo due to which the division cause a normal looking half sized larvae at one side and mal formed embryo from other.

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