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By Scott R. Craven, Robert Ellarson University of Wisconsin

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Extra resources for Landscape Plants that Attract Birds Animals Pets

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A) Cromosomas de un a larva de C hironom us, Nucí nucléolo, b) E l p a r más pequeño de cromosomas de un núcleo de célula de glándula salival de Drosophila niela nogaster; en general el apareamiento de los homólogos es ta l que no se percibe la línea de separación, c) Dotación cromosómica de D. org 5n m ) puntifonne (según B k id c f sj . d ) Esquem a de la estructura de un cromosoma gigante Jorm ado por numerosas cromátidas. Cromosomas 25 15), así c o m o lo s d e s c u b rim ie n to s s o b r e la m u ta c ió n , y la re p lic a ció n sc m ic o n s e rv a d o ra (p á g in a 30).

Los cultivos de Fibroblastos sólo d u ra d e 12-20 horas (fig. 17). La metafase y la analase apenas necesitan más de algunos minutos. La velocidad d e los cro­ mosomas en su m ovim iento de desplazamiento de la placa ecuatorial a los polos es de 1-4 pin p o r m inuto. Esto corresponde a los valores de otros movi­ mientos citoplasinálicos, m ás o menos com o la retracción de los pseudópodos en u n a am eba (pág. 219). org 32 Genética y citología ° DNA Fig. 17. Replicación del D N A . Vl2 inicio de lasegunda mitosis.

L o s m a c h o s d e lo s h im e n ó p te r o s c o m o las avispas, a b e ja s y h o rm ig a s se d e s a r ro lla n p a r te n o g e n é tic a m c n te . La r e p r o d u c c ió n u n ise x u a l ta m b ié n se p re se n ta e n v e rte b ra d o s , lo cual se h a d e m o s tr a d o q u e o c u rr e , e n tr e o tro s , e n cie rta s esp ecies d e lagartijas a m e ric a n a s y caucásicas, cuy as p o b la c io n e s c a re ce n de m a c h o s. A sim ism o , el 3 0 -4 0 % d e lo s h u e v o s d e p av a n o fe c u n d a d o s inician u n d e s a r ro llo p a rte n o g e n c tic o , p e r o e n g en e ra l é ste se d e tie ­ n e e n e sta d io s m u y te m p ra n o s .

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