
【名词&注释】
基因型(genotype)
[单选题]某种群中,基因型 AA 个体占 25 % ,Aa 个体占 60 % ,那么基因 A 与 a 的频率为
A. . 50 %和 50 %
B. . 25 %和 75 %
C. . 55 %和 45 %
D. . 30 %和 70 %
查看答案&解析
举一反三:
[单选题]15 When did the accident happen?
A. At about 8:00 am
B. At about 9:00 am
C. At aboutl0:00 am
[单选题]药用“天麻”与商陆根等伪品的区别之一是其( )。
A. 表面具环纹
B. 肥厚肉质
C. 具鞘鳞片
D. 内含多粒种子
[单选题]The author mentions Harlow’s experiment to show that ______.
A. adults should develop social skills
B. babies need warm physical contact
C. caregivers should be healthy adults
D. monkeys have social relationships
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