Respuesta :

It is because X being subject to transcriptional silencing .

Why these conditions occurs ?
Trisomy x is a genetic disorder , not the inherited one .It occurs during the division of reproductive cells . Autosomal trisomy occurs due to mutations that occur during embryonic development when one person has two or more genotypes.

Typically , male have one X and one Y chromosomes (46 , XY ) , while typically  females have two X chromosomes resulting in a (46,XX) karyotypes . However , female with trisomy X have an extra X chromosomes 47,XXX karyotype .In that case the extra X chromosome present remains transcriptionally silence , so does not show serious phenotypic abnormalities .

In the case of  autosomal trisomy   , individuals may have some cells in their body with the 46 chromosomes and others with 47 chromosomes , which creates this condition which shows serious abnormalities .

Hence , due to the above reason there is difference   between both the abnormalities shown by them .

To learn more about trisomy from the given linkhttps://brainly.com/question/1008403

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