Ở đậu Hà Lan,gen A quy định hạt màu vàng trội hoàn toànso với alen aquy định hạt màu xanh.Cho cây mọc lên từhạt màu vàng giao phấn với cây mọc lên từ hạt màu xanh,thu hoạch được 900 hạt vàng và 895 hạt màu xanh. Gieo số hạt đó thành cây rồi cho chúng tự thụ phấn, theo lý thuyết, khi thu hoạch thì hạt màu vàng chiếm tỉ lệ là:  

Chia sẻ

Một số câu hỏi khác có thể bạn quan tâm.

• Find a mistake in the four underlined parts of the sentence and correct it:

  The purpose of secondary education is to give common knowledge and to prepare for either higher education and vocational education.

• Read the following passage and choose the best answer for each blank:

       Children in (1)_________ Netherlands must be at least four years old to (2)_________ primary education. Almost all 4-year-olds (99.3%) in the country indeed attend primary school, (3)_______ this is not compulsory until children reach the age (4)__________ 5. Primary school is free of charge. In most schools, children are grouped by (5)_________ in mixed ability classes, with one teacher for all subjects. Primary school (6)________ of 8 groups, thus schooling (7)________ for 8 years. During the first two years, which (8)_______ kindergarten, children receive an average of 22 hours of (9)_________ , during the last 6 years children receive an average of 25 hours per week. Schools are open 5 days a week, but children are free on Wednesday afternoon. At the end of primary school, or in group 8, schools advice on secondary school choice. Most schools use a national test to support this advice, for instance the 'Citotoets', a test (10)_________ by the Central Institute for Test development.

   

  1. A. a	B. an	C. the	D. Ø
  2. A. afford	B. enter	C. come	D. run
  3. A. although	B. despite	C. in spite	D. due to
  4. A. of	B. on	C. in	D. for
  5. A. old	B. elderly	C. aging	D. age
  6. A. includes	B. contains	C. consists	D. composes
  7. A. spends	B. lasts	C. lengthens	D. takes
  8. A. also called	B. is also called	C. is called also	D. is also calling
  9. A. educate	B. educative	C. educator	D. education
  10. A. develop	B. to develop	C. developed	D. developing

  
     
    
    

• Choose a word that has different stress pattern:

  expression                 easily                 depression                disruptive

• Choose a word that has different stress pattern:

  algebra               musical                politics                  apartment

• Choose a word that has different stress pattern:

  mechanic              chemistry               cinema                   finally

• Choose a word that has different stress pattern:

  typical               favorite                 division               organize

• Choose a word that has different stress pattern:

  computer              establish                business                  remember

• Choose the correct sentence which is built from the words and phrases given:

  our / will / school / if / access / much / Internet / we / to / learn / the / better / has
  
  

• Choose the correct sentence which is built from the words and phrases given:

  exchange / allows / computers / and / us / to / the / ideas / connect / to / other / Internet
  
  

• Choose the correct sentence which is built from the words and phrases given:

  sharing / Internet / encouraging / new / the / of / working / ways / collaboration / is / from / home / and / information