Which of the following statements is true of crossing-over?
A. Crossing-over always results in a non-beneficial mutation.
B. Crossing-over contributes to genetic diversity or variation.
C. Only one gene may be exchanged at a time during crossing-over.
D. The gene for eye color can be exchanged with the gene for hair color during crossing-over.
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Which of the following statements is true of crossing-over?
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