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How a genetic disease can suddenly appear in a family with no previous history of the disease?
Wiki User
∙ 15y ago
It could happen in two main mechanisms: 1) the allele responsible for the disease is recessive and so each of the parents are healthy portators of the allele (heterozygous), and all the sons which are homozygous for the allele (i.e. have two copies of the allele), with a frequency of 1:4, will be affected by disease, but not the others (heterozygouses and homozygouses for the good allele or wild type). 2) the mutation responsible for the disease (that acts in a dominant manner) is not present in any of the parents but happens only during the formations of gametes, and so will be transmitted to the son. There are also other mechanisms that are less frequent and more difficult to explain in a few words.
Wiki User
∙ 15y ago
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