哺乳动物的雄性性别是由于Y染色体的存在而决定的,极少数46,XX核型的个体也可发育睾丸。在XX男性中大多数有正常的男性内生殖器和外生殖器,即在一条X染色体上存在有限的Yp染色体片段,这是由于在父方减数分裂时偶发X-Y染色体末端交换产生的,临床称之为46,XX男性;少数XX男性生殖器伴有外生殖器发育不全和残留的苗勒氏结构、子宫和输卵管,即在同一个体内 Mammalian male sex is determined by the presence of the Y chromosome, and very few individuals with the 46, XX karyotype may also develop testicles. The majority of XX males have normal male genitalia and genitalia, ie, a limited number of Yp chromosomes on an X chromosome due to occasional XY chromosome excretion at the time of paternal meiosis, clinically referred to as 46, XX males; a few XX male genitalia accompanied by genital hypoplasia and residual Mullerian structure, uterus and fallopian tubes, that is, in the same body