Question

Trisomy detected by amniocentesis is due to

• A. Extra chromosome
• B. Deficiency of chromosome
• C. Translocation of chromosomal segment
• D. None of these

Answer 1

The correct option is A Extra chromosome

Amniocentesis is a process , where amniotic fluid is sampled using a hollow needle inserted into the uterus . This is done to test the health of the fetus , by checking for any type of chromosomal or genetic abnormalities . One of the most common type of chromosomal abnormality found in the world is Down's syndrome . It is caused by the triosomy of the 21st chromosome i.e. instead of two sets of 21st chromosome , there are 3 . This syndrome has a very heavy impact on the fetus .

So the correct option is 'Extra chromosome' .