Guitars usually have ebony or rosewood fretboards. The demand for ebony and rosewood varies with the demand for guitars. This is an example of _________.
Guitars usually have ebony or rosewood fretboards. The demand for ebony and rosewood varies with the demand for guitars. This is an example of _________.
黑腹果蝇的黑檀体基因ebony (e)位于唾腺染色体分区的93C7，请问此基因位于第几染色体？? 第二染色体的右臂|第三染色体右臂|第三染色体的左臂|第四染色体
黑腹果蝇的黑檀体基因ebony (e)位于唾腺染色体分区的93C7，请问此基因位于第几染色体？? 第二染色体的右臂|第三染色体右臂|第三染色体的左臂|第四染色体
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