题目内容
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On chromosome 4 in Neurospora, the allele pyr-1 results in a pyrimidine requirement for growth. A cross was made between a pyr-1 and a pyr+ (wild-type) strain, and the following results were obtained: What is the distance between the pyr-1 gene and the centromere？
A、2.2cM
B、4.4cM
C、8.8cM
D、47.8cM
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