When autopolyploid speciation occurs in a plant, a spontaneous doubling of chromosomes during meiosis produces
____ gametes. If the plant fertilizes itself, a ____ zygote will be produced.
a. haploid; diploid
b. diploid; tetraploid
c. diploid; haploid
d. haploid; tetraploid
e. tetraploid; diploid
ANSWER: b
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Which of the following best describes the innate immunity?
A. It is a response to a specific pathogen. B. It is the basis for the use of vaccines. C. It reacts to a wide variety of pathogens. D. It is a response to a specific pathogen AND is the basis for the use of vaccines.
Animals that are hermaphroditic usually
a. fertilize their own eggs. b. cross-fertilize. c. donate eggs to other individuals. d. cannot reproduce sexually. e. fit all of these descriptions
Radially symmetrical animals have a nerve
__________. Fill in the blank(s) with the appropriate word(s).
Calcium must activate prothrombin to its enzyme form before it can participate in the clotting mechanism
Indicate whether the statement is true or false