作者bluemagpie (贞心相廷)
看板post-b.test
标题生物问题请教
时间Sun Apr 24 21:51:02 2011
1.Which process hinder clarification of the deepest branchings in a
phylogenetic tree that depicts the origins of the tree domains?
(A)binary fission (B)mitosis (C)meiosis (D)horizontal gene transfer
(E)gene duplication
答案是给D不晓得这题答案要如何去解释呢
2.Tree living spices X, Y, and Z share a common ancestor T, as do extinct
spices U and V. Agrouping that includes spices T, X, Y,and Z makes up
(A)a valid taxon (B)a monophyletic clade (C)an ingroup, with spices Uas
the outgoup (D)a paraphyletic group (E)a polyphyletic group
答案是给D但是E为什麽错呢
烦请高手解答谢谢
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1F：推 skypons:解题关键，第一题：种系树的源头能和末端的分支共存 04/24 22:47
2F：→ skypons:共同祖先T，有子分系被排除在外，这是侧系的定律 04/24 22:48
3F：→ skypons:第一题在讲更简单一点就是内共生理论 04/24 22:48