Johnson L A, Clarke R N
U.S. Department of Agriculture, Beltsville Agricultural Research Center, Maryland 20705.
Mol Reprod Dev. 1990 Oct;27(2):159-62. doi: 10.1002/mrd.1080270211.
The relative DNA content of the "O" and Y chromosome-bearing sperm is presented for the creeping vole, Microtus oregoni. The animals had been trapped in Oregon and in Washington State. The two populations had very similar autosomal chromosome relationships but differed greatly in the size of their X chromosome (which is not carried by vole sperm) and in their Y chromosome. The greater size and banding differences of the Y chromosome of the Washington State vole compared to the Oregon vole paralleled the greater differences in sperm DNA between the Y-bearing sperm and the sperm carrying no sex chromosome (O). The actual DNA differences between O and Y sperm was 12.5% for the sperm from the Washington State voles and 9.1% for sperm from the Oregon voles. The difference in sperm DNA content (12.5%) for Washington State voles was far greater than the difference shown for other voles or other mammals.
本文呈现了俄勒冈田鼠（Microtus oregoni）中携带“O”染色体和Y染色体精子的相对DNA含量。这些动物是在俄勒冈州和华盛顿州捕获的。这两个种群的常染色体关系非常相似，但它们的X染色体（田鼠精子不携带）大小以及Y染色体存在很大差异。与俄勒冈田鼠相比，华盛顿州田鼠的Y染色体更大且带型差异更明显，这与携带Y染色体的精子和不携带性染色体的精子（O）之间更大的精子DNA差异相一致。华盛顿州田鼠的O精子和Y精子之间的实际DNA差异为12.5%，俄勒冈田鼠的精子则为9.1%。华盛顿州田鼠精子DNA含量的差异（12.5%）远大于其他田鼠或其他哺乳动物所显示的差异。
