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Look, it's POSSIBLE that incest produces problems. This is because any recessive genes that are around will tend to get matched up, most diseases are caused by recessive genes, and most people have at least one disease floating around in their DNA that they don't know about (because it's recessive!). But that doesn't mean it's going to happen.

Far from it - incest HAS occurred all the time, and the products of incest are very seldom retarded toothless children who can only play the banjo and suck applesauce through a straw, despite what the myths tell you. Look at the historical royal families of Europe, which were very inbred for hundreds of years. A lot of uncommon maladies became much more common for them, but they were hardly universally screwed up.

2006-09-13 11:58:43 · answer #1 · answered by Doctor Why 7 · 1 0

These defects would be difficult to catagorize, since you are asking a broad question.

Basically in any conception of any two people there is a chance that one parent gives you a flawed copy of a gene.

If the other parent has given you a functioning copy of that gene it's presence may be enough to cover and negate the effect of the other.

Since you are talking about "birth defects" the genes that would need to be "defective" are developmental ones, not the "ongoing" genes we use everyday to create proteins to function.

In the center of the cell (the nucleus) Your genes/ DNA is like a master "cookbook". A "copy" (mRNA) is taken out into the cytoplasm of the cell. A organell in the cell "reads" the "copy" and produces the "goodie" (the protein). In this case the protein gets packaged and shipped out of the cell to be used in the blood help build clots.

So each cell has two "cook books" one you got from Mom, and one from Dad, normally if one "cookbook" has a bad recipe, you can get all the "goodies" made from the dirrections in the other book... But what happens if the recipe is the same? Uh oh - no cookie!

This can happen randomly in any population, for example, If you are color blind, and you marry a woman who's father and brothers are colorblind. There is a much higher chance that your children would be color blind, then you would find in the general population. But you are not related by blood, and it is not an incestuous relationship.

Birthdefects can also become consentrated in a population due to something called the "founder effect". This happens when a colony is founded by a small group of people, say about 50-200.

Any "defects" present in those orrigional members become magnified in the future generations because it is such a small gene pool. Even if no one gets married to anyone closer than a second cousin, if enough 3rd and 4th cousins keep getting married, and Their children keep doing the same, the defect can be magnified. Sometimes geneticist study groups of these people in order to "find" a gene in the genome.

To answer your question, any developmental defect that isn't immediatly lethal would be magnified in a consanguine birth.

2006-09-13 18:46:47 · answer #2 · answered by Crystal Violet 6 · 1 0

If the dna is too much alike there will probably be a miscarriage. The other thing is if the baby has one extra chromosone it will have that down snydrome(I dunno how to spell it).

2006-09-13 18:31:11 · answer #3 · answered by Mello 2 · 1 0

they say the baby can come out with retardation , i hope you not sleeping with a relative , thats just nasty

2006-09-13 18:29:09 · answer #4 · answered by ? 2 · 1 0

anything and everything reasons----> genes are to close in similarity anything can and could happen

2006-09-13 18:31:03 · answer #5 · answered by Stacey 3 · 0 0

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