問題詳情
22. Marfan syndrome in humans is caused by an abnormality of the connective tissueprotein fibrillin. Patients are usually very tall and thin, with long spindly fingers,curvature of the spine, sometimes weakened arterial walls, and sometimes eye problems,such as lens dislocation. Which of the following would you conclude about Marfansyndrome from this information?
(A) It is recessive.
(B) It is dominant.
(C) It is pleiotropic.
(D) It is epistatic.
參考答案
答案：[無官方正解]
難度：計算中-1
書單：沒有書單，新增
用户評論
【草薙素子】評論
(A) 隱性的(B) dominance（顯性作用）：同一基因座之基因間互相影響，顯性基因影響隱性基因(C) pleiotropy（基因多效性）：一個基因影響多個蛋白質的表達(D) epistasis（上位作用）：不同基因座上的基因互相影響，上位化的(epistatic)基因決定下位化的(hypostatic)基因的表現。下位化的基因即使在自己的基因座是顯性，仍會受另一個基因座的優勢基因影響而無法表現。