How do mutations passed from parents to children

Based on the new data, a year-old mother and father are 5 to 10 percent more likely to have a child with autism than are a year-old mother and father. But the absolute risk of autism among children born to older parents is still small: roughly 1. While there are a lot of bullets flying, very few are actually hitting the target.

The more likely explanation for how parental age contributes to autism risk — particularly from fathers — is that, for unknown reasons, men who have children later in life tend to carry common variants that predispose their children to autism, experts say.

The results may help researchers determine the likelihood that the sibling of a child with a condition caused by de novo mutations will also carry the mutation. Nature Epub ahead of print Abstract. This story was originally published on Spectrum. Already a subscriber? Sign in. Thanks for reading Scientific American. Create your free account or Sign in to continue.

See Subscription Options. Go Paperless with Digital. Further Exploration Concept Links for further exploration DNA mitochondrial DNA radiation gene replication transcription codon genetic code chromosome amino acid translation allele speciation allele frequency gain of function mutation lethal allele silent mutation DNA repair frameshift mutation leaky mutation nonsense mutation inborn error of metabolism point mutation.

Related Concepts You have authorized LearnCasting of your reading list in Scitable. Do you want to LearnCast this session? This article has been posted to your Facebook page via Scitable LearnCast. Change LearnCast Settings. These disorders can be autosomal —meaning the mutation is on any of the autosomes shown here in orange—or sex-linked —meaning the mutation is on the X or Y chromosome, shown here in pink and blue.

These mutations can be trickier because, depending on the sex, the chromosome pairs are not the same. Men are XY, women are XX. Some Y-chromosome mutations can cause absent or low sperm counts. These mutations can be passed down from fathers to sons. Like autosomal mutations, X-linked diseases can be recessive or dominant. This is important, because in the case of X-linked recessive conditions , such as hemophilia, the chance of a child having the disease is different for boys and girls.

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