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【单选题】

We all know that DNA bas the ability to identify individuals but, because it is inherited, there are also regions of the DNA strand which can relate an individual to his or her family(immediate and extended), tribal group and even an entire population. Molecular Genealogy(宗谱学) can use this unique identification provided by the genetic markers to link people together into family trees. Pedigrees(家谱) based on such genetic markers can mean a break through for family trees where information is incomplete or missing due to adoption, illegal birth or lack of records. There are many communities and populations which have lost precious records due to tragic s such as the fire in the Irish courts during Civil War in 1921 or American slaves for whom many records were never kept in the first place.
The main objective of the Molecular Genealogy Research Group is to build a database containing over 100,000 DNA samples from individuals all over the world. These individuals will have provided a pedigree chart of at least four generations and a small blood sample. Once the database has enough samples to represent the world genetic make-up, it will ually help in solving many issues regarding genealogies that could not be done by relying only on traditional written records. Theoretically, any individual will someday be able to trace his or her family origins through this database.
In the meantime, as the database is being created, molecular genealogy can already verify possible or suspected relationships between individuals. 'For example, if two men sharing the same last name believe that they are related, but no written record proves this relationship, we can verify this possibility by collecting a sample of DNA from both and looking for common markers, in this case we can look primarily at the Y chromosome(染色体),' explains Ugo A. Perego, a member of the BYU Molecular Genealogy research team.
People in a large area any possess the same DNA thread because______.

A.DNA is characteristic of a region

B.
they are beyond doubt of common ancestry
C.
DNA strand has the ability to identify individuals
D.
their unique identification can be provided via DNA
题目标签:染色体
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【单选题】慢性髓细胞白血病急变时,最可靠的染色体变化是()

A.
ph染色体
B.
出现非整倍体
C.
出现假二倍体
D.
出现除ph染色体以外的附加染色体
E.
以上均不对

【单选题】下列关于基因和染色体关系的叙述,错误的是 [ ]

A.
染色体是基因的载体
B.
基因在染色体上呈线性排列
C.
一条染色体上有多个基因
D.
染色体就是由基因组成的