Siblings and dizygotic twins share only 50% of their segregating genes.

同卵双生双胞胎和双卵双生双胞胎分享仅50%的基因。

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However, there are still more genes to be found that influence spontaneous dizygotic twinning.

不过，还有很多与自发性异卵双胞胎有关的基因有待发现。

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A trait or disease is called heritable if monozygotic twins are more similar to each other than dizygotic twins.

如果一种性状或疾病在同卵双胞胎中的同时发生的概率高于异卵双胞胎，那么这种性状或疾病是“可遗传的”。

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Where both twins had the disease, there was an average of 3.66 years difference in age at onset between 25 sets of identical twins, and 8.12 years difference between 20 sets of fraternal (dizygotic) twins, suggesting genes had a role in determining when Alzheimer's was seen.

BBC: NEWS | Health | Alzheimer's risk 'is 80% genetic'