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已知小麦抗病对感病为显性,无芒对有芒为显性,两对性状独立遗传

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  • 【名词&注释】

    基因型(genotype)、梁启超(liang qi-cao)、表现型(phenotype)、有利于(beneficial to)、理论上(theory)

  • [单选题]已知小麦抗病对感病为显性,无芒对有芒为显性,两对性状独立遗传。用纯合的抗病无芒与感病有芒杂交,F1自交,播种所有的F2,假定所有的F2植珠都能成活,在F2植株开花前,拔掉所有的有芒植株,并对剩余植株套袋。假定剩余的每株F2收获的种子数量相等,且F3的表现型符合遗传定律。从理论上(theory)讲F3中表现感病植株的比例为

  • A. 1/8
    B. 3/8
    C. 1/16
    D. 3/16

  • 查看答案&解析 点击获取本科目所有试题
  • 举一反三:
  • [单选题]The girl arranged to have piano lessons at the training centre with her sister ________ she would stay for an hour.
  • A. where
    B. who
    C. which
    D. what

  • [单选题]
  • A. talked about
    B. cared about
    C. wrote about
    D. heard about

  • [单选题]What is the woman’s seat number?
  • A. 6A
    B. 7A
    C. 8A

  • [单选题]She brought with her three friends, none of ______I had ever met before.
  • A. them B. who
    B. whom D. these

  • [单选题]25_______
  • A. if
    B. though
    C. because
    D. while

  • [单选题]梁启超说:“我国蚩蚩四亿之众,数千年受治于民贼政体之下,如盲鱼生长黑壑,不知天地间有□□二字。”省略的两字最可能是
  • A. 君主
    B. 科学
    C. 西学
    D. 民权

  • [单选题]下列关于汤剂的说法,不正确的是( )。
  • A. 汤剂处方的组成是固定的,不能随意加减化裁
    B. 汤剂是复方组成,有利于发挥药物成分的多效性和综合作用
    C. 汤剂用途比较广泛,可以口服和内用
    D. 中药合剂是汤剂的浓缩制品
    E. 置适宜煎器中,加水至浸没药材

  • [单选题]听第6段材料,回答第 6~7 题。第6题:What is the man doing?
  • A. Changing seats on the plane.
    B. Asking for a window seat.
    C. Trying to find his seat.

  • [单选题]What is the purpose of the text?
  • A. To describe the job of a ROM.
    B. To provide information about ALRL.
    C. To announce an open position at ALRL.
    D. To make known the opening of the new laboratories.

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