Three populations of crickets look very similar, but the males have courtship songs that sound different. What function would this difference in song likely serve if the populations came in contact?
A) a temporal reproductive isolating mechanism
B) a postzygotic isolating mechanism
C) a behavioral reproductive isolating mechanism
D) a gametic reproductive isolating mechanism
C
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Sharks differ from most other fish in that they
lack a. gill slits. b. scales. c. bone. d. paired appendages. e. teeth.
Which of the following would be the least
satisfactory organism for genetic research? a. humans b. bacteria c. corn d. fruit flies e. peas
Homeostasis ________
A) is the maintenance of an unchanging internal state B) is a pathological condition C) is the maintenance of a relatively stable internal environment D) is the way the internal environment influences the external environment
Which sequence represents the most typical order of events in seed germination?
a. shoot cells divide and elongate ? root cells divide and elongate ? seed coat splits ? water imbibition b. seed coat splits ? water imbibition ? root cells divide and elongate ? shoot cells divide and elongate c. water imbibition ? seed coat splits ? root cells divide and elongate ? shoot cells divide and elongate d. water imbibition ? root cells divide and elongate ? seed coat splits ? shoot cells divide and elongate