Crossword-Solution: BLASTOMERE 10 letters, 1 clue 🏆 scrabble score: 14

Hans Driesch repeated Roux's fundamental experiment with a different method on the sea-urchin's egg, with a result that was absolutely contrary to that of Roux: the isolated blastomere cleaved like half the egg, but it resulted in a whole blastula and a whole embryo, which differed from a normal one only in its small size.

This result was made still more decisive by Morgan, who showed that it was quite in the power of the experimenter to get either a half-embryo or a whole one of half size, the latter dependent only upon giving to the blastomere the opportunity for a rearrangement of its matter by turning it over.

Schultze has shown in the frog that if at the two-cell stage the egg is held in an inverted position, _i.e._ with the white hemisphere turned upwards, each blastomere gives rise to a whole embryo--the two embryos being united, sometimes in one way, sometimes in another, as shown in Fig.

The head is, however, nearly a whole head, but whether this is due to a whole head developing out of material derived entirely from one of the two blastomeres, or whether, as Roux supposes, a portion of the material of the injured blastomere has been worked over, _i.e._ “post-generated,” remains, I think, an open question.

Nuclei, surrounded by finely granular protoplasm, appear in the protoplasm of the injured blastomere.