Which scenario describes allopatric speciation?
A) A population of squirrels is separated by the Grand Canyon. The two subpopulations evolve into two distinct species.
B) A tetraploid plant species evolves from a diploid ancestor. Both the tetraploid and diploid species are found in the same habitat.
C) One population breeds in the fall; another population breeds in the spring.
D) A male horse and a female donkey mate, producing a sterile hinny.
A) A population of squirrels is separated by the Grand Canyon. The two subpopulations evolve into two distinct species.
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How might the removal of a wetland affect a nearby city?
A. Wetlands support a rich supply of nutrients, so the removal of a wetland would decrease the water quality. B. Wetlands reduce water quality, so the removal of a wetland would improve the water quality. C. Wetlands reduce flooding, so the removal of a wetland would increase the likelihood of the city flooding. D. Wetlands cause flooding, so the removal of a wetland would decrease the likelihood of the city flooding.
Cell differentiation always involves _____
A) the production of tissue-specific proteins, such as muscle actin. B) the movement of cells. C) the transcription of the myoD gene. D) the selective loss of certain genes from the genome. E) the cell's sensitivity to environmental cues, such as light or heat.
Agglutination refers to the
A. clumping of red blood cells. B. development of platelets. C. production of antibodies. D. production of lymphocytes. E. destruction of red blood cells.
The systemic condition often associated with severe infections caused by the presence of bacteria in the bloodstream is known as .
a. dyscrasia b. endocarditis c. pericarditis d. sepsis