You know that all of a person's genetic information is contained on very long pieces of DNA called Chromosomes.
你知道，一个人所有的遗传信息都包含在一个叫做染色体的长DNA片段上。
The placenta and tissue covering it ( called chorionic villi) are made up of the same genetic material as your baby and can provide important information about birth defects.
胎盘和覆盖它的组织（称作绒毛膜）跟你的身体是同一种遗传物质组成的，它们可以提供重要的关于先天缺陷的信息。
The placenta and tissue covering it ( called chorionic villi) are made up of the same genetic material as your baby and can provide important information about birth defects.
胎盘和覆盖它的组织（称作绒毛膜）跟你的身体是同一种遗传物质组成的，它们可以提供重要的关于先天缺陷的信息。
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