Which are structures formed from the neural crest? (Check all that apply.)
_____ a gill chamber of primitive chordates
_____ blastopores
_____ sensory neurons of the dorsal root ganglia
_____ Schwann cells
_____ olfactory and hearing organs
__X__ a gill chamber of primitive chordates
_____ blastopores
__X__ sensory neurons of the dorsal root ganglia
__X__ Schwann cells
__X__ olfactory and hearing organs
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Speciation is the divergence of two populations from a common ancestor. How does it contribute to biological diversity?
A. Speciation increases biological diversity. B. Speciation decreases biological diversity. C. Speciation has no effect on biological diversity.
Genetic modification
A) alters genetic codes so that one species' code is like another's. B) adds sugars and phosphates in a nucleus. C) alters, deletes, or adds DNA to a cell. D) substitutes entire nuclei to genetically engineer a cell.
Which statement best describes the limitations of using of humans in genetic studies of developmental biology?
A) The variation in human development between individuals is too large for genetic studies. B) It is impractical and unethical to conduct experimental manipulation or targeted mutagenesis of humans to examine the role of genes in development. C) It is impractical and unethical to examine and describe abnormalities of human development, such as birth defects. D) Genetic studies of human development are not necessary, because most problems in human development are due to environmental influences and not genetics.
Solutions that are isotonic:a
are not in dynamic equilibrium. b. have equal concentrations of solute and water. c. have equal concentrations of solute but not water. d. have equal concentrations of water but not solute. e. will exhibit a net movement of water from one solution to the other.