先介绍下一些基本知识。
狐臭是X性染色体显性遗传;
设A为致病基因,a为正常基因;
男性性染色体为XY。男性XAY患病,XaY正常;
女性性染色体为XX。女性XAXA、XAXa患病, XaXa正常;
AA、aa称为纯合子,Aa称为杂合子。
如果父母都有狐臭,母亲是狐臭纯合子,则后代无论是男还是女,患病率各为100%。
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/faedab64034f78f0b0030c6175310a55b3191c13?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
父母都有狐臭,母亲是狐臭杂合子,则后代女性患病率为100%,男性为50%。
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/3812b31bb051f819dbca94d8d6b44aed2f73e7b1?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
父亲有狐臭,母亲正常,则后代女性患病率为100%,男性为0%。
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/f703738da9773912e9c912f3f4198618377ae2b1?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
父亲无狐臭,母亲狐臭纯合子,则后代男女患病率各为100%。
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/574e9258d109b3de6bb672fac0bf6c81800a4c13?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
父亲无狐臭,母亲狐臭杂合子,则后代男女患病率各为50%。
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/18d8bc3eb13533fa82be05bca4d3fd1f41345b13?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
父母都无狐臭,孩子不会遗传到狐臭。