Bateson and Punnett crossed two white-flowered lines and saw all purple flowers in the F1 generation. They concluded this was an example of complementary gene interactions because a cross of the F1 plants yielded what ratio in the F2 generation?
A) 8 purple to 8 white
B) 16 purple to 0 white
C) 0 white to 16 purple
D) 7 purple to 9 white
E) 9 purple to 7 white
E
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If N2 gas comprises 79 percent of atmospheric air at sea level, what is PN2?
a. about 300 mm Hg b. about 400 mm Hg c. about 500 mm Hg d. about 600 mm Hg e. about 700 mm Hg
Electron transport molecules that only transfer electrons include
A. ubiquinone. B. FAD. C. NADP. D. ferredoxin.
Beggiatoa are ________.
A. obligate aerobes B. microaerophiles C. obligate anaerobes D. facultative anaerobes
Occasionally, chromosomes fail to separate during meiosis, leading to daughter cells that have an abnormal number of chromosomes. This phenomenon is called
A. chromosome inactivation. B. nondisjunction. C. crossing over. D. epistasis. E. pleiotropy.