In meiosis, DNA replicates during
a)prophase I.
b)prophase II.
c)interphase prior to meiosis II.
d)interphase prior to meiosis I.
e)both prophase I and prophase II.
d)interphase prior to meiosis I.
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In a person with the genotype XXY, we can tell that nondisjunction took place in the mother
A. true B. false
Most human embryos that are aneuploid
A. result in Down's syndrome. B. result in sterility. C. are spontaneously aborted in the first trimester. D. can develop and survive to adulthood. E. are usually the result of increased nondisjunction in the gametes of older men.
How do the pyramids of biomass for Silver Springs, Florida, and the English Channel compare?
a. They are both typical of most ecosystems. b. They both indicate that producers are quickly eaten by herbivores. c. The pyramid for Silver Springs is typical of most ecosystems and the English Channel pyramid indicates that producers are quickly eaten by herbivores. d. The pyramid for Silver Springs indicates that producers are quickly eaten by herbivores, and the English Channel pyramid is typical of most ecosystems. e. Both pyramids indicate overgrowth of producers.
One of the main problems associated with treating human diseases through gene therapy is
A) finding human cells that could potentially be genetically engineered. B) the inability to clone human cells. C) finding a delivery system that would target specific cell types. D) finding the correct form of the gene to be delivered. E) determining a disorder that could be cured through gene therapy.