If a new species is produced by the interbreeding of two members of distinct species, this would be __________ speciation achieved via _________.
A. allopatric; autopolyploidy
B. allopatric; allopolyploidy
C. sympatric; autopolyploidy
D. sympatric; allopolyploidy
E. sympatric; divergence
D. sympatric; allopolyploidy
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Suppose 64% of a remote mountain village can taste phenylthiocarbamide (PTC) and must, therefore, have at least one copy of the dominant PTC taster allele. If this population conforms to Hardy-Weinberg expectations for this gene,
what percentage of the population must be heterozygous for this trait? A) 16% B) 32% C) 40% D) 48% E) 60%
Which chemical is used in both water purification and sewage treatment to provide long-term disinfection?
A. Chlorine B. Activated charcoal C. Fluorine D. Copper sulfate
Which of the following statements regarding food webs is true?
A) A consumer may eat only one type of producer. B) Detritivores consume dead organic matter from a specific trophic level. C) Several species of primary consumers may feed on the same species of producer. D) Nutrient transfer moves from producer to consumer and back. E) A hawk at the top of the food web is only a quaternary producer.
Microbial products can be improved by all of the following EXCEPT
A) isolating new strains. B) mutating existing strains. C) genetically modifying strains. D) modifying culture conditions. E) sterilization.