Recessive physical inheritance.. Physiological and non-nationalities need a gene from both father and mother to cause disease

What is hereditary hereditary inheritance?
1 - the word purporting that it needs a gene from both father and mother to cause the disease.
2 - As for the body means that it is related to chromosomes body and not nationality it can affect the sexes.
3 - the presence of one gene cause a condition called the holder of the gene or the holder of the disease, but not infected.
4. Until the parents have a child who is infected, each of them must be the holder of the inheritance.
5 - for this reason do not see these diseases in all generations have been absent to come back and appear at the meeting of the campaign of genes.
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