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1 简要案情当事人夫妇的亲生儿子已于1998年5月23日病故,留下一个1992年2月6日出生的孙子,由于男婴的母亲已下落不明。要求鉴定该婴儿与祖父母是否存在血缘关系。 2 结果与讨论按照孟德尔遗传规律,该婴儿与其祖父母的基因有1/4相同的机率;而Y染色体连锁遗传表明,Y染表1.3个样本20个STR基因座的基因型
1 Brief case The husband and wife’s own son died on 23 May 1998, leaving a grandson born on 6 February 1992, as the baby boy’s mother has been missing. Asked to identify the baby and grandparent whether there is blood relationship. 2 Results and Discussion According to Mendel’s genetic law, the baby and his grandparents genes have the same probability of 1/4; and Y-chromosome linkage showed that Y-table 1.3 samples of 20 STR loci genotype