题干

下列有关遗传规律的相关叙述中,正确的是(    )

A:Dd个体产生的含D的雌配子与含d雄配子数目比为1:1

B:若两对相对性状遗传都符合基因分离定律,则此两对相对性状遗传一定符合基因自由组合定律

C:位于非同源染色体上的非等位基因的分离和重新组合是互不干扰的

D:若杂交后代出现3:1的性状分离比,则一定为常染色体遗传

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答案(点此获取答案解析)

C

同类题5

根据短文内容完成表格,每空一词。

    If you think you are too shy and want to be a little braver, just try the following things: Be open to others. Tell people you are shy. There is no need to hide it. When they get to know you are a shy kid, they will understand you better. This also helps you feel more comfortable in talks.

    Try to smile more. When you smile, people think you are friendly and easy to talk with. Remember that other people have feelings, too; and most people will stay away from an angry-looking face.

    Learn to be a good talker. If you find it hard to start a conversation, say something nice about people around you. Think about how great you feel when someone says something nice to you. Doesn't it make you want to keep talking to that person?

    Get your attention(注意) elsewhere(在别处). Think more about ways to enjoy parties or games. Don't waste time worrying about your look or whether(是否) people like you or not. You will become relaxed(放松的) and find it's not so hard to talk with others.

Take one small step at a time. Each time when you say “Hi!” or smile at someone, say to yourself “You can make it.” Keep trying and one day you'll never feel shy when you talk to others.

Title: Advice on……to be a little braver

Advice

Reasons

Don't ____ the fact.

If you tell people you are shy, they will understand you better.

____ more

People don't like the one with an angry-looking face.

Start a conversation with ____.____                              words.

People will feel great and want to talk to you.

Pay more attention to ways to enjoy parties or games.

You will feel ____.

Encourage(鼓励) yourself to say “Hi!” or smile at someone.

Keep doing this and you’ll be braver to talk to others in the future.