Is this belief that if we marry cousins, children born will not be healthy right?

Question

suppose those who want to get married have same blood group?

Answer 1

I wish I could find the article but a 2 year long study went on in England about a year ago to discuss this topic, they found that first cousins have very few problems and that in-breeding between first cousins doesn't cause a lot of health concerns. Brother and sister or in the nuclear family does however

Answer 2

Its not a belief its science. this is some thing to do with the DNA and genes.

First cousins are somewhat more likely than unrelated parents to have a child with a serious birth defect, mental retardation or genetic disease, but their increased risk is nowhere near as large as most people think," the scientists said."

And as u said the same blood group from a different family has nothing to do with this.. :)

Answer 3

There are how many billion people in the world today?

Why on earth would you want to marry a cousin?

Answer 4

thats generally the belief but it only extends to first cousins beyond that is not considered to pose a problem.

Answer 5

Having same blood group in these kind of matters is, on the whole, OK.

But if one of them, or both of them have a negative Rh factor, for example, one is O+ and the other is O-, or both of them are O-s then there is every possibility of their child being born with a genetical defect, or even with some unwanted health problems.

Congenital marriages  are not usually encouraged because if both parents have a poor medical history, their children are likely to develope complicated health problems, which may sometime become life threatening issues..

Answer 6

Yes, it is right.  The National Society of Genetic Counselors states that those couples are 13 times more likely to produce a child with a genetic disorder.

Margaret: I don't know where you live, but most states and countries do not allow these marriage. Even WV does not allow marriage between first cousins. Only very Islamic countries allow them.

Answer 7

The reason behind this is because the DNA is too similar and the gene pool will be weak. This is the main reason why dual s*x species have less genetic deficiencies as the DNA gets mixed up.

In single s*x species say ameobas, the same DNA is being replicated in the "children" so any birth defects keep carried on. The DNA pool does not have a chance to eradicate these birth defects.

The closer the relative the more similarities in the DNA. I guess if two identical twins could have offspring, their child would be identical to them.

Answer 8

In family bonds that produce children, siblings/siblings or parents/siblings, usually the rate at which a genetic mutation resulting in miscarriage, death or birth defects are 50/50 or 50%.  In a cousin/cousin, aunt-uncle/nephew-neice or even grandparent/grandchild union can produce genetic mutations resulting in misscarriage, death or birth defects at 25%.  Usually most babies that have problems are aborted NATURALLY.  It is illegal in most places or highly frowned upon to marry this close in relation.  Second cousins are allowed because of the amount of diversity in their genetics.  A good example is the royal family of ancient Egypt.  There were a lot of medical issues as well as a lot of mental ones BECAUSE sisters married brothers and so on.

Answer 9

There is a slightly increased risk of birth defects.  While the normal risk is 2-3%, the risk for these couples is 4%-6%.   Genetic counselling and/or in vitro fertilization with testing to eliminate serious genetic defects can help couples to lower those risks.

So the answer to your question is that MOST children will be born healthy in MOST situations, but if there is a recessive gene for a serious genetic defect in the family, that is where the biggest problems will occur.

The risks are small enough that more states allow these marriages than prohibit them.