Which of the following morphological innovations is found in the ancestor that led to vertebrates?
a. the notochord
b. vertebrae
c. bone
d. neural crest cells
Ans: a. the notochord
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Why do African populations of humans have higher levels of genetic variation compared to non-African populations?
A. Humans originated in Africa, and subsequent migrations resulted in populations seeded by small groups with relatively small amounts of variation. B. Because African populations show strong patterns of assortative mating. C. Numerous migrations to Africa throughout early human history has increased genetic diversity there. D. High levels of UV radiation in equatorial regions of the world have increased levels of genetic mutations in Africa.
What is the smallest unit of evolution?
A. individual organism B. a group of organisms belonging to the same species C. a group of organisms of the same species living together in the same geographical area at the same time D. a population E. Both C and D are correct.
The simplest nitrogenous waste product of protein breakdown is
What will be an ideal response?
The gene wooden leg is necessary for development of phloem. If you stained a late-stage embryo with an anti-Wooden Leg antibody, in what tissue would you expect to see staining?
A. Endosperm B. Procambium C. Ground meristem D. Protoderm