G ib b erellin h as b een ad d ed to th e th ree p

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Unformatted text preview: h ree p lan ts o n th e righ t (F igu r e 4 ). Stu d en t s c an see h o w th ese p lan t s, all gen etically id en tical, g ro w taller w h en gib b erellin is ad d ed . G ib b er ellin is a p lan t h o r m o n e t h at p r o m o t es st em elo n g at io n . G ib b erellin is p ro d u ced in a ser ies o f r eac tio n s, eac h r eq u ir in g an en zy m e co d ed fo r b y a gen e. Sh o rt p lan ts h av e a m u tatio n in th e gen e th at co d es fo r G A 3 -b etaF i g u r e 3 . O n e s t e p i n t h e b r e a k d o w n o f c h l o r o p h y l l . M e n d e l ’s I g e n e ( y e l l o w p e a s ) c o d e s h y d ro x y lase, th e en z y m e fo r th e f o r t h e e n z y m e P A O . M o d ifie d f r o m H ö r t e n s t e in e r ( 2 0 0 6 ) a n d r e p r in t e d w it h p e r m iss io n last step o f th e p ath w ay ( F ig u r e 5 ; fro m A n n u a l R e v ie w s , In c . L est er et al., 1 9 9 7 ) . Sh o r t is r ec essiv e: h eter o z y g o u s p lan ts, d esp ite m o r e c o m m o n t h a n y ell o w , ev en t h o u g h g r een i s r ec essiv e . A n ex am p l e m a k i n g o n l y h a l f a s m u c h o f t h i s e n z y m e , p r o d u c e e n o u g h g i b i n h u m a n s i s H u n t i n g t o n ’s d i s e a s e , t h e d e v a s t a t i n g i n h e r i t e d n e u r o l o g i c a l b e r e l l i n t h a t t h e y a r e o v e r 6 f e e t t a l l . d i s o r d e r t h a t t o o k t h...
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