作者weei (weei)
看板TransBioChem
标题[生物] 两题遗传问题请教~~
时间Wed Dec 29 17:10:11 2010
Which is a mutant characteristic in fruit flies?
A)gray body B)black body C)long wings
When two dihybrid organisms are crossed and simple dominance is present
in both genes a _____ phenotype ratio will result.
A)1:2:1
B)3:1
C)9:3:3:1
D)1:1:1:1
ans:B，A
why?
第一题我完全不知道为何选隐性的???
第二题1:2:1哪里有写出是不完全显性??
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1F：→ biup2:黑身短翅为突变 12/30 17:18
2F：→ biup2:simple dominance 12/30 17:19
3F：→ biup2:... 恩... 是phenotype，我也错了... 12/30 17:22