Somatic cell（体细胞） genetic defects（遗传缺陷） can not be transmitted to the next generation.

多项选择题Challenges of Genetic testing of Inherited（遗传性） retinal（视网膜的） dystrophy（营养不良） include：（）

A.The clinical diagnosis may or may not be specific
B.The inheritance mode is not clear for the isolated cases
C.The progression（进展） of condition can take several decades
D.Locus heterogeneity（位点差异性）

单项选择题In the following mutation screening strategies，which is the most effective and breadth-covered（覆盖广） in nowadays？（）

A.Chromosome banding
B.FISH
C.Mass spectrometry（MS）
D.Next Generation Sequencing（NGS-二代测序）

单项选择题Which statement about essential elements（要素） in a genetic testing for clinicians is NOT true：（）

A.Clinicians should have educational materials about the disease and the test
B.Clinicians should have test result report forms that explain the test and the patient’s testresult
C.Clinicians should have collection of data on phenotype and genotype
D.Essential elements of genetic testing are easy to be acquired（获得）

单项选择题Diseases due to mutations（突变） in different classes of proteins function for：（）

A.Structure of cells and organs
B.Developmental gene expression
C.Transport and storage
D.Control of growth and differentiation
E.All above

单项选择题Human genome consists of about：（）

A.100，000genes
B.80，000genes
C.20，000genes
D.15，000genes