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回复 白巧克力 的帖子3 Q+ ?, m3 y1 D2 r9 Y
S- I2 C& j% R" H' D9 h4 d; ~6 r KThe two main chromatin states are heterochromatin and
, E5 l7 _+ c, w3 X6 Ieuchromatin. Heterochromatin exists in various tightly bound! u2 h* d$ D4 J7 ]+ `, `7 D r
conformations. Euchromatin is less condensed and most often; s/ O5 x& e+ ^ ^. T. u2 G; k
associated with transcriptional activation. Euchromatic genes
# W1 G; R7 r+ gmay be silenced and even exhibit a variegated phenotype when0 a# x% k9 D1 [
juxtaposed to heterochromatic sequences following chromosomal
( \8 @+ F' U$ S: Y* vrearrangement or transposition
0 ~* u R" Y4 c! u v* w0 s这是一整段。本文讲染色体包装的 |
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