Four of these factors have played a part in the extinction of honeycreepers in Hawaii. Which one is the exception?
a. loss of habitat
b. human activities
c. imported species
d. depletion of the ozone layer
e. disease
ANSWER: d
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In Hodags (mythical creatures of Wisconsin), brown fur (B) is dominant over gray fur (b) and long horns (H) are dominant over short horns (h). Two true-breeding hodags, one with brown fur and long horns and the other with gray fur and short horns mate and produce an F1. Two F1 individuals are mated. What proportion of the offspring will exhibit a phenotypic combination that is different from the
P generation? Assume the genes for fur color and horn length are on different chromosomes. A. 1/2 B. 9/16 C. 3/16 D. 6/16 E. 1/16
Chytridiomycetes produce enzymes that digest cellulose, chitin, and similar molecules. Because of this, they are found in the digestive tract of
A. lichens. B. ruminants. C. plants. D. frogs. E. people.
The nonsulfur photosynthetic bacteria use organic compounds as
A) carbon sources. B) electron donors to reduce CO2. C) energy sources. D) electron acceptors. E) oxygen sources.
Which of the following statements is false?
A) When an allele is dominant, the heterozygous combination is the same phenotypically as one of the homozygotes. B) Epistasis would not be expected to occur in a biochemical pathway. C) Dominance refers to the form of expression of a gene in relation to its allele (or alleles). D) Epistasis refers to a gene (or genes) of one pair masking the expression of a gene (or genes) at a different locus. E) Epistasis is a nonallelic interaction; dominance is an allelic interaction.