摘要
性别决定包括初级性别决定和次级性别决定。前者是由染色体决定性腺的发育方向，后者通常是指由性腺分泌的激素决定性腺以外的身体表型，即第２性征。新的研究发现，哺乳动物的雄性是由Ｙ染色体短臂上的一个被称为ＳＲＹ的基因所决定的。
The procedure of sex determination includes both primary sex determination and secondary sex determination.The former concerns the determination of the gonads by the chromosomal.The latter concerns the bodily phenotype outside the gonads.The secondary sexual characteristics are usually determined by hormones secreted from the gonads.New research discovered that the developmental direction of the gonads is determined the SRY gene resided in the short arm of the Ychromosomal.
出处
《国外畜牧科技》
1998年第3期29-32,共4页
Animal Science Abroad
