该病属常染色体隐性遗传，与X-染色体关联，所以，母亲是基因携带者的男性表现为发病。
The disease is autosomal-recessive and linked to the X-chromosome, so that men whose mothers are carriers of the gene manifest the disease.
由于常染色体上出现突变基因而导致的疾病。
A disease caused by the presence of two recessive mutant genes on an autosome.
基因（常为种内同源基因）间功能有重叠的现象。
Redundancy --- The situation in which genes (often paralogous) have overlapping functions.
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