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

Biology & Microbiology

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Indicate whether the statement is true or false

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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

Biology & Microbiology

Which structure, A, B, C, or D, returns nearly all nutrients to the interstitial fluid?

1.A 2.B 3.C 4.D

Biology & Microbiology

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.

Biology & Microbiology