How is the warrior gene inherited?
The MAOA gene is located on the X-chromosome. Men inherit only one X chromosome, so they have only one version of MAOA. If a man inherits the “warrior” gene, they are more likely to be affected by it.
Women have two X chromosomes; hence they can inherit two different versions of the gene. This means that even if a woman inherits one copy of the “warrior” gene, she is less likely to be affected, because she also carries one normal version of MAOA.
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This test looks at how many repeats are present in the regulatory region of the MAOA gene. There are five variants with different numbers of repeats – 2, 3, 3.5, 4 and 5.
- People with 3.5 or 4 repeats have the MAOA-H allele and make high levels of monoamine oxidase A
- People with 2, 3, or 5 repeats have the MAOH-Lallele, known as the “warrior” gene.