第五章单元测试
- Which of the following characteristics is common to species that reproduce sexually (下列哪个是有性生殖物种所共有的特征)? （ ）
- Which statement best describes human sex determination (哪个陈述最能表示人类性别决定)?（ ）
- Nondisjunction in the first meiotic division in a male human could result in _____at fertilization (男性减数第一次分裂中同源染色体互不分离的现象，可能在授精时导致_____). （ ）
- The most plausible explanation for why more human males are at birth than females is that (对于人类出生时男性多于女性的原因，最合理解释是)_____.（ ）
- Which of the following best describes the Lyon hypothesis (以下哪项最恰当地描述了 "莱昂假说")? （ ）
A:Different sets of sex chromosomes in males and females (雌雄个体的性染色体不同) B:Morphologically distinguishable male and female gametes (形态上可以区分的雌雄配子) C:Meiosis (减数分裂) D:Y chromosome in males ( 男性的 Y 染色体 )
答案:Meiosis (减数分裂)
A:Individuals with one X chromosome are male.(有一条 X 染色体的个体是男性) B:Females are heterogametic (雌性是异形配子的). C:Individuals with a Y chromosome are male.(有一条 Y 染色体的个体是男性) D:Individuals with two X chromosomes are female.(有两条 X 染色体的个体是女性)
A:XXX syndrome( XXX 综合征) B:Klinefelter syndrome (克莱里菲尔特综合征) C:either A or B( A 或 B) D:Turner syndrome (特纳氏综合征)
A:Total female mortality during pregnancy exceeds total male mortality (妊娠期间女性的总死亡率超过男性的总死亡率) B:males produce more Y-bearing sperm than X-bearing sperm(男性产生的 Y 型精子多于 X 型精子) C:Y-bearing sperm are more viable than X-bearing sperm(男性产生的 Y 型精子比 X 型精子 活力更强) D:the female reproductive tract is less hospitable to X-bearing sperm(女性生殖道对X 型精子的适宜性较低)
A:The paternal X chromosome of a female is inactivated in an early embryonic stage ( 雌性的父系 X 染色体在胚胎早期阶段失活). B:Barr bodies are inactivated on X chromosomes.( 巴氏小体在 X 染色体上失活) C:The maternal X chromosome of a female is inactivated in an early embryonic stage.( 雌性的母系 X 染色体在胚胎早期阶段失活) D:One of the two female X chromosomes is randomly inactivated in an early embryonic stage.( 雌性两条 X 染色体中的一条在胚胎早期随机失活)
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