Compare the issues involved in the use of embryo screening for cystic fibrosis and for polydactyly.

Screening embryos for conditions carries the risks of possible harm to the mother and harm to the embryo, including possible loss of the embryo. The result of the screening could also carry ethical implications, such as whether to terminate the pregnancy. Cystic fibrosis is a genetic disease which results in thick, sticky mucus in the airways, leading to difficulty breathing and a reduced quality of life. There is no cure and life expectancy of someone with cystic fibrosis is approximately 40 years. Screening for this disease can allow for the parents to make a decision about whether to continue with pregnancy or not, and if they do wish to continue, they are able to put preparations in place. Polydactyly is the condition where someone is born with an extra finger or toe. It has no impact on life expectancy or quality of health, therefore the risks of screening (harm to mother, embryo and possible loss of embryo) are not justifiable in this case.