【单选题】(替换画线部分)Dolphins might be trained to cooperate with fishermen and help them by finding, tracking,herding, or even catching fish-- whose activities dolphins are expects.
【单选题】听力原文:W: Wasn't that a terrific lecture on dolphins? I didn't know that dolphins traveled in such large groups, or were able to communicate with other members of their group with those whistle-like sou...
B.
From a television program.
C.
During a trip that she took..
【单选题】下列叙述正确的是( ) ①手术后的双眼皮不是性状,不能遗传,也不由基因控制 ②猫的黄色和狗的黑色是一对相对性状 ③在培育转基因生物过程中,被转入的基因应该转入到生殖细胞中 ④性状是生物体的形态结构特征、生理特性和行为方式 ⑤环境不能改变生物的性状 ⑥转基因鼠证明基因控制生物的性状.
【单选题】(江西省萍乡一中2019-2020学年调研)在猫的基因中,B控制黑色性状,b控制黄色性状,Bb则表现为虎斑色,B和b都位于X染色体上,现有一只虎斑色雌猫与一只黄色雄猫交配,产生的小猫可能有( )
【单选题】Irish Dolphins May Have a Unique Dialect Irish scientists monitoring dolphins living in a river estuary in the southwest of the country believe they may have developed a unique dialect to communicate ...
【单选题】在猫中(B)控制黑色性状,(b)控制黄色性状,Bb则表现为虎斑色,B和b基因都位于X染色体上,现有一只虎斑色雌猫与一只黄色雄猫交配,产生的小猫可能有
【多选题】根据生物因子作用强度与种群密度的关系,可将其分为