If four of the original colonists died before they produced offspring, the ratios of genotypes could be quite different in the subsequent generations. This would be an example of
A) diploidy.
B) gene flow.
C) genetic drift.
D) disruptive selection.
E) stabilizing selection.
Ans: C) genetic drift.
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Corneal implants have been implicated in a few cases of
A. botulism. B. trypanosomiasis. C. Creutzfeldt-Jakob. D. scrapie.
Heart cells in the embryo will be derived from which germ layer?
A) mesoderm B) endoderm C) ectoderm D) none of the above
A true body cavity completely surrounded by ____ is called a coelom
a. ectoderm
b. mesoderm c. endoderm d. exoderm e. mesoglea
What is the path of an excreted water molecule as it moves from the glomerulus to collecting duct?
A. distal convoluted tubule-glomerular capsule-proximal convoluted tubule-loop of nephron--collecting duct B. glomerular capsule-proximal convoluted tubule-loop of nephron-distal convoluted tubule-collecting duct C. proximal convoluted tubule-glomerular capsule-loop of nephron-distal convoluted tubule-collecting duct D. glomerular capsule-proximal convoluted tubule-distal convoluted tubule-loop of nephron-collecting duct E. loop of nephron-glomerular capsule-proximal convoluted tubule-distal convoluted tubule-collecting duct