A dihybrid cross of linked genes theoretically gives a phenotypic ratio of
A. 1:1.
B. 9:3:3:1.
C. 3:1.
D. 1:1:1:1.
E. 2:1.
C. 3:1.
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A plant's ability to absorb carbon dioxide is reduced when:
A. water is limited B. temperatures are extreme C. stomata are closed D. the epidermis is lacking E. mesophyll cells lack air spaces
Photosynthesis must provide a source of electrons and H+ ions because ______________
a. atmospheric CO2 must be oxidized by adding electrons b. CO2 must be reduced to produce sugars c. hydrogen atoms are added to oxygen to form water d. hydrogen ions and electrons react to produce hydrogen gas e. hydrogen ions and electrons are converted into oxygen gas
Postzygotic isolating mechanisms occur when the offspring
a. survive to reproductive age. b. have vigorous health. c. inherit the same numbers of chromosomes from each parent. d. inherit different sets of instructions for development from each parent. e. have hybrid viability.
The Enterobacteriaceae do not produce oxidase compared to the pseudomonads that do produce oxidase.
a. true b. false