Animal traction in Africa (GTZ-Publikationen)

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89). Las horm onas pueden ser las que decidan lo uno o lo otro. L os crom osom as plum ulosos s o n c ro m o s o m a s g ig a n te s (hasta casi 1 n iin d e larg o ) c o n u n a e s tru c tu ra activ a p a rtic u la r; se n o s p r e ­ s e n ta n e n lo s n ú c le o s d e los oocitos d e v e rte b ra d o s (fig. 15), p e r o t a m ­ b ié n e n lo s e sp e rin a ro c ito s d e D ro so p h ü a , e n d o n d e , s in e m b a r g o ú n i ­ c a m e n te el c ro m o s o m a Y (p ág. 63), im p re s c in d ib le p a r a la n o r m a l fo rm a c ió n d e los e sp e rm a to z o id e s, p re se n ta estas p a rtic u la rid a d e s.

9, 10, 16). a estructura fin a d e los crom osom as n o e stá a ú n su fic ie n te m e n ic a c la ra d a , a p e s a r d e la in c o rp o r a c ió n d el m ic ro s c o p io electró n ico . Sin e m b a r g o , se m u ltip lic a n lo s in d icio s e n fa v o r d e la c o n c e p c ió n s e g ú n la c u a l c a d a c r o m á tid a e stá f o r m a d a n o r m a lm e n te p o r u n a ú tu c a fib rilla q u e está d o b la d a y e n r o lla d a d e u n m o d o m u y c o m p le ­ j o . L o s lu g a re s d e lo s c r o m o s o m a s e n q u e las e sp ira s d e las c ro m á tid a s f o r m a n n u d o s id a d e s se d e n o m in a n crom óm eros .

Org Cromosomas 21 C a d a u n o d e lo s c r o m o s o m a s q u e e stá n r e u n id o s e n u n n ú c le o se d istin g u e n p o r su ta m a ñ o , f o r m a y sig n ificad o fu n c io n a l (figs. 9,34). Ri y a e n el a ñ o 1888. L o s g a m e to s m a d u r o s só lo c o n tie n e n u n a d o ta c ió n c r o m o s ó m i­ ca; lo s n ú c le o s so n h a p lo id es (n). P o r la fe c u n d a c ió n se c o m b in a u n a Fig. 9. Dotación cromosómica d el hombre: autosomas 1 -2 2 y cromosomas Y y X .

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