Clearly one has to recognize the propensity for genetic anomalies to occur at a greater rate in close relations. If it is a matter of genetics then the close relations share part of the same genetic code--and not through distant generations. However, ever increasing scientific discoveries might be able to cut down on the occurrence of these anomalies.
I've seen genetic counselors say that the possibility of genetic disorders among offspring of cousins is 2-2% higher than the general population. Marrying your cousin is legal in many states, and is a norm in some cultures. Albert Einstein's parents were cousins. It seems that there is some risk involved, but that genetic counseling and modern technology might mitigate that (even though cousin marriage was well underway long before those modern possibilities).
But your question didn't specify how close the close relation is. Sibling marriage is one of the only taboos that all cultures hold, though the reason could be as much sociological as biological. Most agree, however, that producing offspring with your sibling would result in genetic disorders.
"Frog people", that's what they were called. They had a face that was pushed in. No one would marry them -- they married among themselves -- inbreeding? I saw some live and up close, but they recoiled from me in fear, so I quickly diverted my eyes.
In some ancient culture, if you could "paint both eyes with one stroke" the person was considered bad to procreate with. The Frog-faced people were producing more Frog-faced people, but the general revulsion of the non-Frog-people population will probably keep the numbers of the Frog people down.
So if people are closely related will their kids be weird? Not necessarily, but if there are recessive genetic elements, they -- those genetics-- have a greater probability of expression with inbreeding.
Of course, there is no random in genetics -- certain people choose definite people -- it's not random.
A genetic disorder is a disease that is caused by an abnormality in an individual's DNA. Abnormalities can range from a small mutation in a single gene to the addition or subtraction of an entire chromosome or set of chromosomes. This possibility is more among the individuals marry in close relations.
Yes..you are right!Recurrent miscarriages, children with genetic disorders all happen due to such marriages..I hope ARTs(Assited Reproductive Technology) may help such people. Like getting surrogated moethers, test tube babies etc.