Among the dihybrid crosses below, which will produce offspring with a 1:1:1:1 genotypic ratio?
A) AA BB × aa bb
B) Aa Bb × Aa Bb
C) Aa Bb × aa bb
D) Aa BB × aa BB
E) AA bb × aa BB
C) Aa Bb × aa bb
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Which of the following is characteristic of animals?
(a) heterotrophy. (b) autotrophy. (c) photosynthesis. (d) both b and c.
Primary productivity is dependent upon all of the following EXCEPT for the ____
a. number of plants in the ecosystem b. rate of photosynthesis c. rate of energy use by plants d. sunlight and rainfall amounts e. levels of oxygen
Which of the following makes pollination important?
a. It enables recognition of male and female flowers in plants. b. It enables the pollinator to feed. c. It enables fertilization and reproduction in plants, while the pollinator has no benefits. d. It enables fertilization and reproduction in plants, while the pollinator can feed.
A limitation of cell culture technology is loss of histotype.
a. true b. false