A zebroid is the sterile hybrid offspring of a horse and a zebra. This is an example of ____
a. hybrid inviability
b. hybrid sterility
c. allopatric speciation
d. prezygotic reproductive isolation
e. hybrid breakdown
ANSWER: b
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Reptiles are very efficient in conserving water during excretion
Indicate whether the statement is true or false
Which structure, A, B, C, or D, returns nearly all nutrients to the interstitial fluid?
1.A
2.B
3.C
4.D
A genetic library contains all the DNA fragments of
A. the entire genome of a species. B. a specific chromosome of a species. C. all the genes expressed in a certain cell type. D. any of these. E. none of these.
In which of the following pairs do both evolutionary processes introduce new genetic variation into a population?
a. Natural selection and genetic drift b. Mutation and gene flow c. Natural selection and gene flow d. Gene flow and genetic drift