家系图，表明亲缘与婚姻关系的图。家系图常根据不同情况而采用不同的样式。一般男用□表示，女用○表示；□、○以横线连结的称为婚姻线，表示为夫妇。
在家系图被作好以后，遗传顾问会分析家族中乳腺癌的模式。
After the family tree has been constructed, the genetic counselor analyzes the pattern of breast cancer in the family.
理想的家系图应该追溯到至少三代以上，并且包括每个亲属曾经患过的癌症类型和他们被诊断出疾病时的年龄。
Ideally, this family tree should go back at least three generations and should include the type of cancer each relative has had, as well as the person's age at diagnosis.
他们利用这个遗传序列与其他HIV - 1的遗传序列构建出起源病毒株的家系图，并以此估算出HIV - 1 M组的起源时间。
They used this and other HIV-1 genetic sequences to construct a family tree of the origin of the viral strain and to estimate the time of origin of HIV-1 group m.
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