Which of the following is not involved in gravitational equilibrium?
A. otoliths
B. vestibular nerve
C. saccule
D. cupula
E. utricle
Answer: D
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The fourteen species of finch native to the Galapagos Islands
a. were victims of a mass extinction there b. evolved from a single common ancestor c. migrated in waves from South America d. evolved after a mass extinction of birds that previously lived in the islands e. were victims of a mass extinction there
In radishes, long or round are homozygous forms of an incompletely dominant gene, and oval is the phenotype of the
heterozygote. If a long radish is crossed with a round radish, give the genotypic and phenotypic ratios of the F2 generation. What will be an ideal response?
Male mallard ducks have had emerald green head feathers and wings with metallic blue patches for hundreds of years,
whereas females have been drab, brown-feathered ducks. This phenotypic situation suggests that mallards may be an example of ____. a. directional selection b. Polyploidy c. allopatric speciation d. disruptive selection e. sexual selection
A stretch reflex is
a. somatic. b. autonomic. c. both a and b. d. none of the above.