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【单选题】普通小麦是六倍体，有42条染色体，科学家们用其花药离体培养出的小麦幼苗是（）
A.
三倍体、21条染色体
B.
单倍体、21条染色体
C.
三倍体、三个染色体组
D.
单倍体、一个染色体组
【单选题】Genetic Testing Genetic testing is transforming medicine and the way families think about their health. As science uncovers the complicated secrets of DNA, we face difficult choices and new challenges...
A.
5 to 10 percent.
B.
10 percent.
C.
About 15 percent.
D.
5 percent.