This represented "a female with Tay Sachs". Tay-Sachs disease (TSD) is a deadly hereditary issue, most normally happening in kids, that outcomes in dynamic devastation of the sensory system. Tay-Sachs is caused by the nonappearance of an indispensable compound called hexosaminidase-A (Hex-A).
Tay Sachs disease runs in Rebecca's family. When she looked at her family pedigree, she saw a shaded circle. This represented a female with Tay Sachs. Tay-Sachs disease (TSD) is an inherited (genetic), incurable disease of the central nervous system which affects males and females equally.
