** Ở một loài hoa, kiểu gen AA biểu hiện kiểụ hình hoa đỏ; kiểu gen Aa biểu hiện kiểu hình hoa hồng; kiểu gen aa biểu hiện kiểu hình hoa trắng; Gen B qui định tính trạng hoa kép. Gen b qui định tính trạng hoa đơn. Phép lai nào không xuất hiện hoa đơn, màu trắng trong thế hệ sau?

Chia sẻ

Một số câu hỏi khác có thể bạn quan tâm.

• Choose one sentence that has the same meaning as the root one:

  The house needs painting.
  
  

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

  I / hope / you / able / come / share / fun / us / that day//.

• Choose the word that has the underlined part pronounced differently from the rest:

  put                foot              should               communicate

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

  Why does your teacher want you to learn dancing for?

• Choose a word that has different stress pattern:

  technology             magazine               computer              mysterious

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

  Normally, the atmosphere at a funeral is solemn and delightful.

• Choose the best answer for the following sentence:

  What makes a computer such a _________ device?
  
  

• Choose the best answer for the following sentence:

  At present the school cannot _________ to buy all the computers it needed.
   

• Choose the best answer for the following sentence:

  He asked me __________.
  
  

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

                               TRADITIONAL MUSIC AND FOLK MUSIC
        The Tech Multimedia Music Dictionary defines traditional music (1)_________ music of the (2)________ people that has been passed on by memorization or repetition rather than by writing, and has deep roots (3)__________ its own culture. It is still being (4)_______ in this way today.
        According to Webster's dictionary, folk music is the "traditional and typically anonymous music that is an expression of the life of the people in a community". People play and sing together rather than watching others (5)___________ .
        Folk music is somewhat synonymous with traditional music. Both terms are used semi-interchangeably (6)_________ the general population; (7)__________, some musical communities that actively play (8)_________ folkloric music (see Irish traditional music and Traditional Filipino music for specific examples), have adopted the term traditional music as a means of distinguishing their music (9)________ the popular music called "folk music", especially the post-1960s singer-songwriter" genre.
        Folk songs are commonly seen as songs that express something about a way of life that exists now or existed in the past or is (10)__________ to disappear (or in some cases, to be preserved or somehow revived).
        Traditional music, folk music, folk songs are very valuable for each cultural community to distinguish it from the others.

   

  1. A. like                       B. as                       C. alike                  D. for
  2. A. common               B. ordinary              C. special              D. professional
  3. A. from                     B. at                        C. in                      D. on
  4. A. passed off           B. passed into         C. passed away    D. passed on
  5. A. perform               B. make                   C. act                    D. do
  6. A. between             B. amongst              C. beside               D. within
  7. A. although             B. thus                     C. however            D. therefore
  8. A. life                       B. alive                    C. live                     D. living
  9. A. from                    B. at                         C. in                       D. on
  10. A. for                     B. about                   C. on                      D. in