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, Đem lai giữa P thuần chủng thu được F1 đồng loạt ngô hạt đỏ. Cho F1 giao phối với cá thể I chưa biết KG, thu được F2-1 phân li KH như sau: 1637 ngô hạt đỏ, 275 ngô hạt vàng, 273 ngô hạt trắng. Biết ngô hạt trắng mang toàn gen lặn. a, Giải thích đặc điểm di truyền tính trạng màu sắc ngô. b, Không lập sơ đồ lai, cho biết KG của P, F1 và cá thể đem lai với F1. c, Nếu cho F1 giao phối với cá thể II, nhận được kết quả F2-2 phân li KH theo tỉ lệ 1 ngô hạt vàng:2 ngô hạt đỏ:1 ngô hạt trắng. Viết sơ đồ lai của F1 phù hợp với kết quả trên
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II. Read the following text and answer the questions by choosing the option A, B or C. HOW TO TRAIN YOUR DOG TO PLAY BASKETBALL Start by getting your dog to fetch a ball and bring it to you. If your dog can’t do that, you should stop now. Your dog will probably not make a great basketball player. Instead of taking the ball directly from the dog, hold a box or container at ground level and make the dog drop the ball into the box. Give the dog a treat every time she correctly drops the ball in the container. All good dog tricks should be learned in small steps. Every time the dog brings the ball back to you, raise the box up off the ground just a little bit more. Soon the dog will have to stand on her hind legs to reach it. Don’t forget to reward the dog every time. Once the dog has learned to drop the ball in the container, try using a basketball hoop instead of a box. To begin with, keep the hoop low to the ground. Then gradually raise the height. Reward the dog with a treat each time she gets a basket. Pretty soon your dog will start jumping to reach the hoop and a basketball star will be born! 1. What is the first step in training your dog to play basketball? A. Teach the dog to jump B. teach the dog to bring a ball to you C. Teach the dog to stand on her legs 2. What do you do whenever the dog do correctly what you tell her? A. Give her a treat B. Reward her with a treat C. A and B are correct. 3. When the dog can drop the ball in the container, what do you do next? A. Hold a box or container at ground level B. Raise the box up off the ground instead a box. C. Try using a basketball hoop instead of a box. 4. To be a good dog trainer, what should you do? A. Speak to the dog loudly B. Teach the dog when she is young C. Do it in small steps and usually reward the dog 5. How do you get the dog to jump up to the basketball bet? A. Put a reward in basket. B. Start with the basket low to the ground and keep raising it in small steps. C. Clap your hands

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