When the gene for rat growth hormone was injected
into mouse eggs,
a. they were subsequently implanted
unsuccessfully into female mice.
b. a third of the offspring of the surrogate mothers
grew much lager than their littermates.
c. the rat gene integrated into the mouse DNA, but
did not express itself.
d. the rat gene failed to integrate into the mouse
DNA.
e. all of the offspring of the surrogate mothers
grew much larger than their littermates.
Answer: b
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