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.

Question

Quizplus · Accepted Answer

When the gene for rat growth hormone was injected into mouse eggs and subsequently implanted into female mice, a third of the offspring of the surrogate mothers grew much larger than their littermates. This indicates that the rat gene successfully integrated into the mouse DNA and expressed itself, resulting in a phenotype of increased growth.

When the Gene for Rat Growth Hormone Was Injected into Mouse