Một loài thực vật có bộ NST 2n = 20. Có thể xuất hiện tối đa bao nhiêu dạng thể ba của loài này?

Phát biểu nào sau đây không đúng khi nói về thể dị đa bội?

Mạch thứ nhất của gen có tỷ lệ $\frac{A+T}{G+X}$ = 0,4. Tỷ lệ này ở mạch còn lại là

Khi phát biểu về liên kết gen, phát biểu nào sau đây đúng?

Ở nơi khí hậu nóng, ẩm vùng nhiệt đới, nhóm sinh vật nào sau đây thường cho năng suất sinh học cao nhất?

 Khi nói về đột biến gen, phát biểu nào sau đây không đúng. 

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.

Colors are one of the most exciting experiences in life. I love them, and they are just as important to me as emotions are. Have you ever wondered how the two are so intimately related?

Color directly affects your emotions. Color both reflects the current state of your emotions, and is something that you can use to improve or change your emotions. The color that you choose to wear either refects your current state of being, or reflects the color or emotion that you need.

The colors that you wear affect you much more than they affect the people around you. Of course they also affect anyone who comes in contract with you, but you are the one saturated with the color all day! I even choose items around me based on their color. In the morning, I choose my clothes based on the color or emotion that I need for the day. So you can consciously use color to control the emotions that you are exposed to, which can help you to feel better.

Color, sound, and emotions are all vibrations. Emotions are literally energy in motion; they are meant to move and flow. This is the reason that real feelings are the fastest way to get your energy in motion. Also, flowing energy is exactly what creates healthy cells in your body. So, the fastest way to be healthy is to be open to your real feelings. Alternately, the fastest way to create disease is to inhibit your emotions.

Which of the following can be affected by color?