Tumour cells removed from an individual with retinoblastoma are _________________ for a deletion of the RB gene.

Name: Tumour cells removed from an individual with retinoblastoma are _________________ for a deletion of the RB gene.
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Tumor cells removed from an individual with retinoblastoma are homozygous for a deletion of the RB gene, meaning both alleles of the RB gene are deleted or mutated, which is consistent with the two-hit hypothesis for cancer development.

Tumour Cells Removed from an Individual with Retinoblastoma Are _________________