两只白色家兔交配后， * * 下八只小兔，其中六只白色、两只黑

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问题选择题

两只白色家兔交配后， * * 下八只小兔，其中六只白色、两只黑色。若用D表示显性基因，d表示隐性基因，则所生黑色小兔的基因组成是

A．DD

B．Dd

C．dd

D．DD或Dd

答案

答案：C

亲本是白色，子代出现黑色，说明黑色是隐性性状，白色是显性性状，那么黑色小兔的基因组成为dd。

阅读理解

Read the dialogue and judge. 阅读对话，判断正(√)误(×)。

salesperson: May I help you?

Jenny: Yes! I want to buy a dress, please. Where are the dresses?

salesperson: I'll show you. This way, please. Here they are.

Danny: Excuse me!

salesperson: Yes? May I help you?

Danny: Where is the ice cream?

salesperson: Ice cream? I'm sorry. This department store has shoes, clothes, toys, books and bicycles, but no

ice cream.

( ) 1. Jenny wants to buy a dress.

( ) 2. Danny wants to buy ice cream.

( ) 3. Danny buys ice cream.

实验题

下列动物中：海马、青蛙、蛇、龟、鸡、兔都是哪种类群的动物？（6分）