Reading3-2 (dragged) 2

Reading3-2 (dragged) 2 - w o lf h o u n d s, t e rr ie r s,...

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Unformatted text preview: w o lf h o u n d s, t e rr ie r s, g r ey h o u n d s, M exica n h ai r less d o gs a n d c h i h u a h u as w o u l d eve n g u ess t h e m t o b el o n g t o t h e sa m e s p ecies? Si m ila r ly, ca bb age ( B r a ssic a ole r a ce a ) was va r i o u sly selec t e d f o r i t s leaves ( ca bb age a n d kale ) , s t e m s ( k o h l r a b i ) , fl o we r s h oo t s ( b r o cc o li a n d ca u lifl o we r ) a n d b u d s ( b r u ssels s p r o u t s ) . W h y so f e w w ild s p ec i es w e r e d o m est i c a te d T h e wil d a n i m al s p ecies t h a t m o s t p la u si b ly c o u l d h ave yiel d e d val u a b le d o m es t ica t es we r e la r ge t e rr es t r ial m a mm alia n h e r b iv o r es a n d o m n iv o r es, o f w h ic h t h e w o r l d h o l d s 148 s p ecies weig h i n g 45 kg o r m o r e ( Ta b le 9.2 o f r ef. 1 ) . Ye t o n ly 14 o f t h o se 148 s p ecies we r e ac t u ally d o m es t ica t e d ( Ta b le 9.1 o f r ef. 1 ) , p r o m pt i n g u s t o ask w h a t p r eve n t e d d o m es t ica t i o n o f t h e o t h e r 134 s p ecies? Si m ila r ly, w o r l d- wi d e t h e r e a r e a b o u t 200,000 wil d s p ecies o f h ig h e r p la n t s, o f w h ic h o n ly a b o u t 100 yiel d e d val u a b le d o m es t ica t es. Es p ecially s u r p r isi n g a r e t h e m a n y cases i n w h ic h o n ly o n e o f a cl o sely r ela t e d g r o u p o f s p ecies b eca m e d o m es t ica t e d . F o r exa m p le, h o r ses a n d d o n keys we r e d o m es t ica t e d , b u t n o n e o f t h e f o u r ze b r a s p ecies c o n ge n e r ic a n d a b le t o i n t e r b r ee d wi t h t h e m 3,22 . T h e key q u es t i o n c o n ce r n i n g t h is selec t ivi t y o f d o m es t ica t i o n is as f o ll o ws: i n t h e cases o f all t h o se s p ecies n eve r d o m es t ica t e d , d i d t h e d iffic u l t y lie wi t h t h e s p ecies i t self, o r wi t h t h e p e o p le i n d ige n o u s t o t h e a r ea t o w h ic h t h e s p ecies was n a t ive? F o r i n s t a n ce, is t h e a b u n d a n ce o f la r ge wil d m a mm als t h e r eas o n w h y n o m a mm al s p ecies was eve r d o m es t ica t e d i n s u b e q u a t o r ial Af r ica, m aki n g d o m es t ica t i o n s u p e r fl u o u s f o r Af r ica n s? I f t h a t ex p la n a t i o n we r e c o rr ec t , t h e n Af r ica n p e o p le s h o u l d als o h ave ig n o r e d E u r asia n d o m es t ic m a mm als w h e n t h o se we r e fi n ally i n t r o d u ce d t o Af r ica, a n d E u r o p ea n a n i m al b r ee d e r s o n a rr ivi n g i n Af r ica s h o u l d h ave s u ccee d e d i n d o m es t ica t i n g s o m e Af r ica...
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