The sunflower species Helianthus anomalus is thought to have been formed by hybridization between the sunflower species H. petiolaris and H. annuus because it contains a set of chromosomes from both parental species. H. anomalus is most likely an example of instantaneous speciation through
A. allopolyploidy.
B. parthenogenesis.
C. hybrid sterility.
D. autopolyploidy.
Answer: A
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A. autotrophs B. facultative anaerobes C. obligate anaerobes D. aerobic E. phototrophs
The Pacinian corpuscle is used in detecting
a. sound. b. pressure. c. chemicals. d. sight. e. chemical differences
Double fertilization produces a ________ embryo and a ________ endosperm.
A. triploid, diploid B. haploid, diploid C. diploid, haploid D. haploid, triploid E. diploid, triploid
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A. chemoorganoautotrophic metabolism B. chemoorganoheterotrophic metabolism C. photolithoautotrophic metabolism D. chemolithoautotrophic metabolism