Hamm R L, Scott J G
Department of Entomology, Comstock Hall, Cornell University, Ithaca, NY 14853, USA.
J Med Entomol. 2009 Jan;46(1):169-72. doi: 10.1603/033.046.0121.
The male sex determining factor (M) in the house fly is linked to the Y chromosome in the ancestral condition, but can also be linked to another chromosome (I-V or X). However, descriptions of the linkage and frequency of M factors in different populations throughout the world are vastly incomplete. We collected house flies from a dairy in Ipswich, Australia, and determined that M was linked to chromosomes II, III, IV, and Y. Most males (69.8%) were homozygous for M on autosome II and/or III, and 92.3% of the males had multiple M factors. In all, there were 13 different male genotypes found. The high frequency of M, the presence of M on four different linkage groups, and the large number of male genotypes found in this population make it unique relative to other populations of house flies that have been examined.
家蝇中的雄性性别决定因子（M）在原始状态下与Y染色体连锁，但也可与其他染色体（I-V或X）连锁。然而，关于世界各地不同种群中M因子连锁情况和频率的描述极为不完整。我们从澳大利亚伊普斯维奇的一家奶牛场收集了家蝇，并确定M与染色体II、III、IV和Y连锁。大多数雄性（69.8%）在常染色体II和/或III上M为纯合子，92.3%的雄性有多个M因子。总共发现了13种不同的雄性基因型。该种群中M的高频率、M在四个不同连锁群上的存在以及发现的大量雄性基因型，使其相对于其他已研究的家蝇种群而言具有独特性。
