单选题The sperm-separation technique is based on the fact that the chromosomes responsible for babies’ sex _____.Aare of different shapesBare of different sizesCcan be identifiedDcan be reproduced
单选题
The sperm-separation technique is based on the fact that the chromosomes responsible for babies’ sex _____.
A
are of different shapes
B
are of different sizes
C
can be identified
D
can be reproduced
参考解析
解析：
文章最后一段作者提到分离精子的技术是基于X染色体比Y染色体大。科学家用一种机器把大小不同的染色体分开。
文章最后一段作者提到分离精子的技术是基于X染色体比Y染色体大。科学家用一种机器把大小不同的染色体分开。
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