Genetic Screening

Question 1

What is the process where embryos are screened in IVF?

Answer 1

Pre-implantation genetic diagnosis

Question 2

What is CVS and when is it carried out ?

Answer 2

Chorionic villus sampling 11-14 weeks
- sample of embryonic tissue is taken from placenta and DNA is analysed

Question 3

What is amniocentesis and when is this carried out?

Answer 3

15-20 weeks
- Sample of amniotic fluid containing foetal cells is obtained using a needle, thenDBA is analysed

Question 4

What are some ethical/social issues surrounding genetic testing?

Answer 4

• risk of harm to foetus or miscarriage
• outcome of testing might lead to abortion
• cost of bringing up baby with a genetic disorder
• emotional and mental issues around carrying a baby with a genetic disorder

Question 5

What are pros and cons of CVS?

Answer 5

+ can be carried out earlier, allowing more time to make a decision and prepare
– higher risk of miscarriage than amniocentesis

Question 6

What are pros and cons of amniocentesis?

Answer 6

+ lower risk of miscarriage
– carried out later in pregnancy, have to wait for foetal cells to develop