单项选择题

A female-male mosaic fruit fly may be formed, if there is chromosome loss or______．

A．equal division during sperm generation
B．abnormal mitosis during merogenesis(fertilized egg cleavage)
C．meiosis in embryo
D．meiosis when sperm is tailed
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单项选择题
Extranuclear inheritance related analysis is very different from that for nuclear inheritance, ______．
A．extranuclear genes usually express uniparental inheritance
B．maternal effect is an inheritance phenomenon that offspring only express maternal traits
C．maternal inheritance is an inheritance phenomenon that offspring only express maternal nuclear genotype
D．cytoplasmic inheritance only happens in eukaryotes(organisms whose cells contain nucleus)
单项选择题
对于双因子杂交试验而言，F1代产生4种配子，比例为1:1:1:1，F2代基因型比和表现型分离比分别为______。
A．(1:2:1)2和(2:1)2
B．(1:2:1)2和(3:1)2
C．(1:2:1)3和(3:1)2
D．(1:2:1)2和(3:1)3
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