Một quần thể tự thụ phấn có thành phần kiểu gen là: . Cho rằng mỗi gen quy định một tính trạng, alen trội là trội hoàn toàn, quần thể không chịu tác động của các nhân tố tiến hóa khác. Theo lí thuyết, có bao nhiêu phát biểu sau đây đúng?

(1) F5 có tối đa 9 loại kiểu gen.

(2) Ở F2, có 25% số cá thể dị hợp tử về 2 cặp gen.

(3) Ở F3, có số cây đồng hợp tử lặn về 2 cặp gen chiếm tỉ lệ 77/160.

(4) Trong số các cây mang kiểu hình trội về 3 tính trạng ở F4, số cây đồng hợp tử chiếm tỉ lệ 69/85.

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 31 to 35:

 In Germany, it's important to be serious in a work situation. They don't mix work and play so you shouldn't make jokes (31) _______ you do in the UK and USA when you first meet people. They work in a very organized way and prefer to do one thing at a time. They don't like interruptions or (32)_______ changes of schedule. Punctuality is very important so you should arrive on time for appointments. At meeting, it's important to follow the agenda and not interrupt (33) _______ speaker. If you give a presentation, you should focus (34) _______ facts and technical information and the quality of your company's products. You should also prepare well, as they may ask a lot of questions. Colleagues normally use the family names, and title - for example "Doctor" or "Professor", so you shouldn't use first names (35) _______ a person asks you to.

Question 31:         

Phát biểu nào sau đây đúng?         

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 31 to 35:

 In Germany, it's important to be serious in a work situation. They don't mix work and play so you shouldn't make jokes (31) _______ you do in the UK and USA when you first meet people. They work in a very organized way and prefer to do one thing at a time. They don't like interruptions or (32)_______ changes of schedule. Punctuality is very important so you should arrive on time for appointments. At meeting, it's important to follow the agenda and not interrupt (33) _______ speaker. If you give a presentation, you should focus (34) _______ facts and technical information and the quality of your company's products. You should also prepare well, as they may ask a lot of questions. Colleagues normally use the family names, and title - for example "Doctor" or "Professor", so you shouldn't use first names (35) _______ a person asks you to.

Question 32:    

Hòa tan hoàn toàn 7,8 gam hỗn hợp X gồm Al và Mg trong dung dịch HCl dư, thu được 8,96 lít khí H₂ (đktc) và dung dịch chứa m gam muối. Giá trị của m là:

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 31 to 35:

 The warming of the Pacific Ocean has created weather pattern (31)_______ strongly affect the world. When the water is warm, the amount of rainfall in Indonesia and the surrounding regions decreases. Australia could (32)_______ experience a drought in many parts. On the other hand, Chile (which borders the Pacific Ocean) is preparing for severe rainstorms. In Pakistan and northwestern India, the weather pattern makes the rainy season weaker and makes the area much drier. This happening is called El Nino and is used (33)_______ weather forecasters to make long-range weather predictions. They also know that El Nino will bring unusually rain to the southwestern part of the United States and make the central part of the country drier at the same time. According to research, weather forecasters (34)_______ know about the coming weather with certainty. Now everything has become completely different. El Nino itself used to be predictable. It would occur every two to seven years. But now this weather pattern is becoming more frequent. We cannot say when and how often tornadoes or cyclones occur. Scientists are unsure of the reason for this (35)_______ on the global scale either.

Question 32:

Các kim loại X, Y, Z đều không tan tan trong nước ở điều kiện thường. X và Y đều tan trong dung dịch HCl nhưng chỉ có Y tan trong dung dịch NaOH. Z không tan trong dung dịch HCl nhưng tan trong dung dịch HNO₃ loãng, đun nóng. Các kim loại X, Y, và Z tương ứng là:

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 31 to 35:

 The warming of the Pacific Ocean has created weather pattern (31)_______ strongly affect the world. When the water is warm, the amount of rainfall in Indonesia and the surrounding regions decreases. Australia could (32)_______ experience a drought in many parts. On the other hand, Chile (which borders the Pacific Ocean) is preparing for severe rainstorms. In Pakistan and northwestern India, the weather pattern makes the rainy season weaker and makes the area much drier. This happening is called El Nino and is used (33)_______ weather forecasters to make long-range weather predictions. They also know that El Nino will bring unusually rain to the southwestern part of the United States and make the central part of the country drier at the same time. According to research, weather forecasters (34)_______ know about the coming weather with certainty. Now everything has become completely different. El Nino itself used to be predictable. It would occur every two to seven years. But now this weather pattern is becoming more frequent. We cannot say when and how often tornadoes or cyclones occur. Scientists are unsure of the reason for this (35)_______ on the global scale either.

Question 31:     

Cho 8,6 gam hỗn hợp gồm Cu, Cr, Fe nung nóng trong oxi dư đến phản ứng xảy ra hoàn toàn thu được 11,8 gam hồn hợp X. để tác dụng hết với các chất có trong X cần V lít dung dịch HCl 2M. Giá trị V là:

Đốt cháy 6,72 gam kim loại M với oxi dư thu được 8,4 gam oxit. Nếu cho 5,04 gam M tác dụng hết với dung dịch HNO₃ dư thu được dung dịch X và khí NO (là sản phẩm khử suy nhất). Thể tích khí NO (đktc) thu được là: 

Cho 0,36 gam một kim loại R thuộc nhóm IIA tác dụng với oxit dư thu được 0,6 gam oxit. Tính nguyên tử khổi của R?