题目内容

In which of the following organisms is gender/sex determined by the temperature during embryonic development（）

A. many turtles and alligators
B. humans
C. mice
D. fruit flies
E. many snakes and birds

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Which of the following chromosome constitutions would never lead to a viable human baby being born（）

A. YY
B. XXX
C. XYY
D. XO （O = the absence of a second chromosome）
E. XXY

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The R locus determines flower color in a new plant species. Plants that are genotype RR have red flowers, and plants that are rr have white flowers. However, Rr plants have pink flowers. What type of

A. incomplete dominance
B. complete dominance
C. codominance
D. complementation
E. lethal alleles

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Which of the following are NOT prokaryotes（）

A. viruses
B. eubacteria
C. archaea
D. ancient bacteria

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If a healthy cell passes the G1/S checkpoint（）

A. DNA will be replicated
B. it will enter the G0 stage of the cell cycle
C. it will not divide
D. it will proceed immediately to cytokinesis
E. it will die

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In which of the following organisms is gender/sex determined by the temperature during embryonic development（）

A. many turtles and alligators B. humans C. mice D. fruit flies E. many snakes and birds

Which of the following chromosome constitutions would never lead to a viable human baby being born（）

The R locus determines flower color in a new plant species. Plants that are genotype RR have red flowers, and plants that are rr have white flowers. However, Rr plants have pink flowers. What type of

Which of the following are NOT prokaryotes（）

If a healthy cell passes the G1/S checkpoint（）

A. many turtles and alligators
B. humans
C. mice
D. fruit flies
E. many snakes and birds