Major Problems in Developmental Biology by Michael Locke

By Michael Locke

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A s w e h a v e said, t h e r e is w i d e s p r e a d a c c e p t a n c e of t h e c o n c e p t of d i f f e r e n t i a l r e l e a s e of i n f o r m a t i o n , a n ac­ ceptance based on t h e p l a u s i b i l i t y of the hypothesis of r e g u l a t i o n of g e n e a c t i v i t y i n b a c t e r i a a n d o n t h e f e w c l e a r e x a m p l e s of c h r o m o s o m e puffing and compaction. The evidence for differential replication of D N A is j u s t as c o n v i n c i n g , b u t t h e " n e e d " f o r d i f f e r e n t i a l r e p l i c a t i o n i n t e r m s of o u r c u r r e n t h y p o t h e s i s h a s b e e n , u n t i l r e c e n t l y , less c o m p e l l i n g .

B a l u d a a n d Jamieson (1961) w e r e a b l e to show that a single infectious unit was sufficient t o i n d u c e a l l f o r m s of t h e disease o n t h e basis of t i t r a t i o n d a t a o b t a i n e d b y i n t r a v e n o u s i n j e c t i o n of c h i c k e m b r y o s . T h e p r o p o r t i o n of birds which developed dose-response c u r v e p r e d i c t e d b y t h e z e r o t e r m of t h e P o i s s o n d i s t r i b u ­ one or more forms of leukosis followed the t i o n , i n d i c a t i n g r a n d o m d i s t r i b u t i o n of i n f e c t i o u s u n i t s .

I t w a s con­ c l u d e d t h a t t h e f a i l u r e of t h e b u l k of t h e p o p u l a t i o n t o b e t r a n s f o r m e d was n o t d u e to genetic incompetence b u t must h a v e a n o t h e r e x p l a n a t i o n . A t a b o u t the same time studies by Stoker's g r o u p o n h a m s t e r e m b r y o cells g a v e s i m i l a r r e s u l t s ( S t o k e r a n d M a c p h e r s o n , 1 9 6 1 ) . I n s t u d i e s e m p l o y i n g a n e s t a b l i s h e d cell l i n e natal hamster kidney 1962) (BHK-21) subsequent d e r i v e d f r o m neo­ (Macpherson and Stoker, 1962; Stoker and Abel, t h e i n c i d e n c e of t r a n s f o r m a t i o n r e m a i n e d l o w a l t h o u g h these cells h a d a n i n c r e a s e d p l a t i n g efficiency.

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