Incurred risk of blood Weddings

Of all the world's population, probably about 20-50 percent of marriages between relatives to live with a partner originating from the same ancestor. True blood wedding (close bloodlines) risky to bring the defective offspring?

Marriage is meant here is incest between cousins, one clan or family lines near, but not the blood-bladder or incest.

Incest marriage the couple usually a lot happening just realized after tracing his family line. Incest marriage also happened to Charles Darwin, who married his first cousin Emma.

"One of the dangers that could arise from incest marriage is difficult to prevent diseases associated with bad genes a parent to his children someday," said Debra Lieberman of the University of Hawaii, as quoted from LiveScience, Monday (31/05/2010) .

Lieberman said the marriage with siblings or close relatives who could improve dramatically the possibility of getting two copies of harmful genes, than if married to someone who comes from outside the family.

This is due to each person to bring a copy of the bad gene and no normal gene that can replace it, so there must be some problem that could eventually cause the child to have a short life time.

Professor Alan Bittles, director of human genetics center in Perth, Australia has been collecting data on the mortality of children born of marriages between cousins from around the world.

It is known that there is an additional risk of death increased approximately 1.2 percent compared to marriage was not a close relative. Meanwhile there was an increased risk of birth defects around 2 percent in the general population and 4 percent in the marriage that her parents have a close kinship.

Genetic conditions more common in relatives of marriage are rare recessive disorder that can cause various problems, such as blindness, deafness, skin diseases and neurodegenerative conditions.

"Nearly all men carry the genetic mutation, but when a population has a smaller scope then the gene mutation will become more common," says Prof. Bittles, as quoted from the BBC.

If two people who carry a recessive gene reproduce, their children will have a one in four chance to have these disorders and one of the two children have the opportunity to be the bearer of properties (carrier).

This is a dangerous marriage or blood relatives who have close family relationships, because the risk of certain diseases or genetic conditions becomes greater.

Professor Bittles explains very important for people to be married to conduct genetic testing beforehand in order to prevent negative impacts that may occur in children. This method is selective filtering much more effective.