A:一般来说,基因型决定表现型
B:等位基因控制相对性状
C:杂合子自交后代没有纯合子
D:性状分离是由于基因分离
I want to buy _________ piano for my daughter as the birthday gift. She's good at playing ________ piano. What do you think of _________ black one?
填上合适的介词。
Look ____ the monkeys.
图示的西伯利亚地区是俄罗斯的一个重要开发区,这里针叶林广布.据此回答下列各题。