What do we mean when we use the terms monohybrid cross and dihybrid cross?
A) A monohybrid cross involves a single parent, whereas a dihybrid cross involves two parents.
B) A dihybrid cross involves organisms that are heterozygous for two characters that are being studied, and a monohybrid cross involves organisms that are heterozygous for only one character being studied.
C) A monohybrid cross is performed for one generation, whereas a dihybrid cross is performed for two generations.
D) A monohybrid cross results in a 9:3:3:1 ratio whereas a dihybrid cross gives a 3:1 ratio.
B
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In Hershey and Chase’s experiment, why would it not have been suitable to use radioactive nitrogen to label DNA?
What will be an ideal response?
What evolutionary advantage do flowers provide to angiosperms?
a. They metabolize sunlight faster than in plants without flowers. b. They prevented predation by herbivores, as their bright colors served as a warning to keep away. c. They developed a cooperative evolutionary relationship with pollinators, which delivered pollen to female gametophytes more directly. d. They provided shade and protection from sunlight in hot climates.
Laboratory simulations provide indirect evidence that organic compounds such as __________ and __________ selfassemble
spontaneously under conditions like those thought to have prevailed on the early Earth. Fill in the blank(s) with the appropriate word(s).
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A.) cDNA enzymes B.) bacterial polymerases C.) restriction enzymes D.) DNA polymerases