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
<上一题 目录 下一题>
热门 试题

问答题
In an inversion heterozygote. one of its chromosomes shows the following linkage relationship: In the homologous chromosome, there exists an inversion in the region (1)What type of inversion is it (2)Please draw a synaptic scheme(联会图)of these two chromosomes. (3)If in the inverted chromosome region there is a lethal gene D at d locus, and in the normal(i.e., without inversion)chromosome there is another lethal gene F at f locus. How much of F1 individuals will be double(both at d and f loci) heterozygote when the inversion heterozygote self-crosses Why
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)
相关试题