Tamryn has a son who has Duchenne muscular dystrophy,which is inherited as an X-linked recessive trait.At a molecular level,the disease is due to lack of the protein dystrophin.Tamryn participates in a study to look at dystrophin levels in various muscles,so has cells sampled from 10 different muscles.Some cells make dystrophin,and some do not.An explanation for this finding is that

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In females, one of the X chromosomes is randomly inactivated in each cell, a process known as X-inactivation or lyonization. This means that in some cells, the X chromosome with the normal dystrophin gene is active, allowing for dystrophin production, while in others, the X chromosome with the mutation is active, leading to no dystrophin production.

Tamryn Has a Son Who Has Duchenne Muscular Dystrophy,which Is