By Eric H. Davidson (Auth.)
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Extra resources for Gene Activity in Early Development
2 . 3 , c o n t a i n s subunits o f b o t h parental origins. T h e significance o f t h e e x p e r i m e n t is t h a t such hybrid proteins c a n form only when t h e e n z y m e is b e i n g synthesized. T h e abs e n c e o f t h e hybrid e n z y m e in t h e a n d r o g e n e t i c e m b r y o s shows t h a t the m a t e r n a l forms are not being synthesized even after stage 19. T h a t is, no m a t e r n a l messenger R N A for this e n z y m e is b e i n g translated. T h e r e f o r e , rather t h a n b e i n g synthesized de novo t h r o u g h o u t early d e v e l o p m e n t , t h e m a t e r n a l e n z y m e is already present in t h e egg at fertilization.
2 . 4 . As c a n b e seen in this figure, c l e a v a g e amphiasters a r e f o r m e d in t h e b l a s t o m e r e c y t o p l a s m despite t h e a b s e n c e of chromosomes. T h e enucleation experiments (many more o f which could b e listed) h a v e d e m o n s t r a t e d t h a t t h e division o f t h e egg mass i n t o cells separated by m e m b r a n e s , t h e m o s t obvious function o f t h e c l e a v a g e process, is d e p e n d e n t o n m a t e r n a l c y t o p l a s m i c factors rather t h a n o n t h e embryo genome.
R. , J. H. Bell, and M. Baca (1966). J. Cell Biol. 30, 579. not b e c o m e c o m p l e t e l y c l e a r until 1 8 8 3 , with t h e publication o f V a n B e n e d e n ' s careful observations o f c h r o m o s o m a l m o v e m e n t s b e f o r e , during, and after fertilization in Ascaris. Several o f t h e essential plates from V a n B e n e d e n ' s classic 1883 paper are r e p r o d u c e d in F i g . 2 . 2 . T h e use o f Ascaris megalocephala c o n t r i b u t e d e n o r m o u s l y to t h e c o r r e c t interpréta- 32 2 .
Gene Activity in Early Development by Eric H. Davidson (Auth.)