The failure of chromosomes to separate during mitosis or meiosis is called
a. genetic displacement.
b. trisomy.
c. crossing over.
d. nondisjunction.
e. disjunction.
D
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Mangrove forests are found primarily in
A) tropical areas. B) freshwater areas. C) eutrophic areas. D) cold-water areas.
A plant, such as an iris, that reproduces asexually most of the time probably
A) forms spores. B) is found in a changing environment. C) lacks the ability to make flowers. D) has offspring that live in the same environment as the parents. E) produces offspring that move into new environments.
Watson and Crick were the first to ____________.
A. discover DNA’s double helical structure B. discover DNA C. isolate DNA D. build the first DNA model E. clone DNA
Children in the United States are vaccinated with the (IPV/OPV/PEP) to prevent polio. (Use all uppercase in your answer.)
What will be an ideal response?