13. (5.0分)基因突变是指( )A gene mutation is defined as()A DNA中的碱基对组成与序列的变化Changes in base pair composition and sequence in DNAB 染色体结构异常 Chromosomal structural abnormalitiesC 染色体数目及结构异常 Abnormalities in chromosome number and structureD 染色体数目异常 chromosome number abnormalities

13. (5.0分)基因突变是指( )A gene mutation is defined as() A DNA中的碱基对组成与序列的变化Changes in base pair composition and sequence in DNA B 染色体结构异常 Chromosomal structural abnormalities C 染色体数目及结构异常 Abnormalities in chromosome number and structure D 染色体数目异常 chromosome number abnormalities