Two species of frogs belonging to the same genus occasionally mate, but the offspring do not complete development. What is the mechanism for keeping the two frog species separate?
A) the postzygotic barrier called hybrid inviability
B) the postzygotic barrier called hybrid breakdown
C) the prezygotic barrier called hybrid sterility
D) gametic isolation
E) adaptation
Answer: A) the postzygotic barrier called hybrid inviability
You might also like to view...
The sexual spores of actinomycetes are called sporangiospores.
Answer the following statement true (T) or false (F)
The part of the brain that controls the basic responses necessary to maintain life processes (breathing,
heartbeat) is the a. medulla oblongata. b. corpus callosum. c. fissure of Rolando. d. cerebellum. e. cerebral cortex.
Antimicrobics effective against only gram-positive bacteria would be termed
A. synthetic drugs. B. antibiotics. C. broad-spectrum drugs. D. narrow-spectrum drugs. E. semisynthetic drugs.
Which of the following intestinal protozoa are considered parasites of humans only?
A. Entamoeba histolytica B. Balantidium coli C. Cyclospora cayentanensis D. Giardia intestinalis E. both Entamoeba histolytica and Cyclospora cayentanensis