In a genetic cross between two bacteriophage T4 rII mutants, r+ recombinants are produced. The genetic changes in these two rII mutants must be
A) heterozygous.
B) heteroallelic.
C) homozygous.
D) homoallelic.
E) polymorphic.
B
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A mycelium is best defined as a(n) ____
a. mushroom b. mass of hyphae c. association between a fungus and a plant root d. reproductive structure of a fungus e. fungal cell
There are more than 30 blood group genes in humans, in addition to the ABO locus. This increases ________ in human populations.
A. gene flow B. homozygosity C. genetic variability D. founder effects E. selective mating
Which of the following does not provide evidence for evolution?
A) the fossil record B) the inheritance of acquired characteristics C) comparative morphology D) molecular biology E) radiometric dating Refer to the scenario below and then answer the following question(s). In a fossil bed, you discover the preserved bones of a winged animal mixed in with the bones of small rodents. The small rodents are known from other fossils to have lived about two million years ago, but they are now extinct.
All of the following are correct about food irradiation, except
A. it can lead to a longer shelf life for the irradiated food. B. no irradiated food can be sold without clear labeling. C. food is not made radioactive by the process. D. the World Health Organization does not endorse this process. E. it is approved in the U.S. for beef, chicken, and pork.