What is the main factor in the occurrence of speciation?
a. Biochemical isolation
b. Hybridization
c. Temporal isolation
d. Geographic isolation
d
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Which of the following structures does not function as a fermentation chamber?
A. abomasum B. rumen C. reticulum D. cecum E. All of these structures function as fermentation chambers.
In humans, having dimples in the cheeks is a dominant trait. If a child has dimples but only one of her parents does, what are the genotypes of her parents?
A. One parent dd, other parent DD B. one parent dd, other parent Dd C. one parent Dd, other parent DD D. one parent must be DD, the other parent could be either dd or Dd E. one parent must be dd, the other parent could be either Dd or DD
Four of the five choices listed below are made only
of gametophyte tissue. Select the exception. a. pollen grains b. megaspore c. ovule d. pollen tube e. male gametophyte
Refer to Figure 48-1. Which compound is the primary nitrogenous waste product of amphibians?
a. 1 b. 2 c. 3 d. 4 e. 5