Two species of tree frogs occupy different elevations in the canopy of a rain forest. If these frogs with strikingly different patterns of coloration but similar patterns of activity are brought together, they can produce offspring that survive to adulthood and can then mate successfully with individuals of either species. What keeps these frogs recognizably distinct?
a. Lack of hybrid fertility
b. Habitat isolation
c. Temporal isolation
d. Mechanical isolation
e. Lack of hybrid viability
Answer: b. Habitat isolation
Biology & Microbiology
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a. 10. b. 20. c. 30. d. 40. e. 50.
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In this chemical synapse, which structure represents the synaptic cleft?
a. A b. B c. C d. D e. E
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In peas, the round allele is dominant over the wrinkled allele. A plant with round peas was crossed to a plant with wrinkled peas and all of the resulting plants had round peas. What is the genotype of the parents in this cross?
A) RR × rr B) RR × Rr C) Rr × rr D) Rr × Rr E) rr × rr
Biology & Microbiology
Which network of protein filaments reinforce the inner surface of the nuclear envelope in animal cells?
a. actins b. tubulins c. lamins d. chromatins
Biology & Microbiology