A narrow hybrid zone separates the toad species Bombina bombina and Bombina variegata. What is true of those alleles that are unique to the parental species?
A) Such alleles should be absent.
B) Their allele frequency should be nearly the same as the allele frequencies in toad populations distant from the hybrid zone.
C) The alleles' heterozygosity should be higher among the hybrid toads than in toad populations distant from the hybrid zone.
D) Their allele frequency on one edge of the hybrid zone should roughly equal their frequency on the opposite edge of the hybrid zone.
C
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Indicate whether the statement is true or false.
Biochemical systems within the stigma of a flowering plant prevent the pollen from a different species from developing a pollen tube and fertilizing its eggs. This is an example of what kind of reproductive isolation?
A. pre-zygotic, behavioral isolation B. pre-zygotic, temporal separation C. pre-zygotic, lock and key D. post-zygotic, temporal separation E. post-zygotic, ecological separation
During the Gram stain, the application of alcohol results in the decolorization of ______ cells.
A. gram-negative B. pleomorphic C. all D. gram-positive
The range of all factors that influence whether
a species can obtain resources essential for survival and reproduction is its a. habitat. b. niche. c. carrying capacity. d. ecosystem. e. community