西农莎能山羊间性遗传机制研究

The Genetic Mechanism of Intersexuality in Milk Goats of Saanen Breed of Xinong

本文从解剖学、组织学、细胞遗传学及遗传学方面对西农莎能山羊的间性个体进行了研究。发现从雌性假间性到性逆转雄性的一系列类型的间性，全部是遗传雌性（６０，ＸＸ），核型正常。这些间性个体完全受基因作用，使雌性向雄性转化，引起性别异常，因而间性基因是雄性化基因，位于常染色体，属隐性遗传。研究指出，间性与无角是由不同基因控制的，解决了近半个世纪来山羊间性遗传的争论问题。正常：间性＝３：１，但是间性全部是遗传雌性，因而是一个十分特殊的分离比。

Intersexual goats of Saanen breed of Xinong at Northwestern Agricultural University were studied in anatomy, histology,cytogenetics and genetics. The different types of intersexuality were seen, ranging from psudohermaphroditic female to male types, including testicular hypoplastitic and sex revers male. All of them were genetic female type(60, XX),the karyotype,normal,so the intersexual bodies caused by the gene, which located at autosomes, having masculinizing effect, and in homozygote made female turn to male incompletely.It was pointed that intersexuality and polledness were controled by different genes, the half centrury standing problem on intersexual inheritance of goats has been solved.The normal: the intersexual=3:1, but the intersexual came from genetic female,this is a very special segregative ratio.