__________ help(s)explain why fragile X syndrome is expressed only when it is passed from the mother to the child.

Question

Quizplus · Accepted Answer

Genomic imprinting helps explain why fragile X syndrome is only expressed when it is passed from the mother to the child. This is because the FMR1 gene, which causes fragile X syndrome, is located on the X chromosome. In females, one X chromosome is randomly inactivated in each cell to ensure that both copies of genes on the X chromosome are not expressed. However, in some cases, the FMR1 gene may still be active on the inactivated X chromosome when it is inherited from the mother due to a phenomenon called genomic imprinting. This can lead to the development of fragile X syndrome.

__________ Help(s)explain Why Fragile X Syndrome Is Expressed Only When