Get the answer of: When is Prenatal Diagnosis Done ? Prenatal diagnosis by amniocentesis is useful for prevention of birth of genetically abnormal children. Families having repeated abortions and/or congenital malformations (defects from birth) are likely to be carriers of a genetic anomaly ("high risk" families). The genetic counsellor can estimate the probability or chance for a future child in [...]
The following points highlight the three main types of genetic mechanisms. The types are: 1. Immuno-Genetics 2. The HLA System 3. The Rh Factor. Type # 1. Immuno-Genetics: Genetic mechanisms which control immune responses have opened up an entire new field of immuno-genetics. Basically it is the study of antigens, antibodies and their reactions. An antigen is a substance present [...]
The following points highlight the three main types of inheritance with its characteristics. The types are: 1. Autosomal Dominant Inheritance 2. Autosomal Recessive Inheritance 3. Polygenic Disorders and Multifactorial Inheritance. Type # 1. Autosomal Dominant Inheritance: Farabee in 1905 gave the first description of a pedigree showing brachydactyly (short fingers and toes), an autosomal dominant trait. Some more examples are [...]