40. Sister chromatids are__?
(A) genetically identical and attached to each other at the
centromere；
(B) genetically different and attached to each other at the centromere；
(C)
genetically identical；
(D) genetically different.
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Sister chromatids a...
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這是一題關於細胞生物學與遺傳學的基礎題目...
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