[QUOTE="yoshi-lnex"]It's wrong becouse it produces children with genetic problems.Kid-Icarus-
Proof? This is something which is still debated
Nobody worth their salt debates that. It's like saying that the Earth being round is debatable, because some people still believe the Earth is flat.
"Genetically, unfavorable recessive mutations are always entering into the
population, every generation. These are not immediately selected out because,
being recessive, they do not express themselves unless the bearer receives the
same deleterious recessive from each parent. If the recessive is matched with a
healthy dominant, the individual bearer is fine. If the recessive is matched
with the same recessive from the other parent, the offspring expresses the
unfavorable trait, and hence may die, or be functionally impaired. So, whether
a child is injured by being homozygous for a given deleterious recessive is a
function of the probability that both parents have the same recessive gene.
The probability that both parents will have the same rare harmful recessive is
low (e.g., 1 in 1000 x 1 in 1000) unless they are related to each other. To be
related means they share genes in common from a recent common ancestor. When
close relatives mate, the probability that the resulting children will get
paired sets of deleterious recessives jumps enormously. For example, if a
lethal recessive exists in the population with a frequency of 1 in 1000, the
probability an individual who gets this gene from one parent will also get it
from the other is 1 in 1000. If, on the other hand, a father has the recessive,
there is a 1 in 4 chance that it will pass to both his son and his daughter. If
the son and daughter then mate and produce a child, the probability that they
will then both pass this gene to the child is again 1 in 4 (or a total
probability of being homozygous for this recessive of 1 in 16)."
http://www.anth.ucsb.edu/faculty/tooby/****s/anth7/incest.htm
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