In the case of human height genes, a gene on chromosome 15 codes for an enzyme that converts testosterone to estrogen. This enzyme influences human height because:
A. testosterone helps bones to fuse at their ends and thus stop growing.
B. estrogen brings on menstruation and thus an end to growth in height.
C. estrogen helps bones to fuse at their ends and thus stop growing.
D. testosterone prevents bones from fusing and thus continues growth in height.
Answer: D. testosterone prevents bones from fusing and thus continues growth in height
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