Q.All are true regarding holoprosencephaly
(HPE) except
a. Alobar
holoprosencephaly is the most severe form of HPE
b.The alobar form is most common (46% to 54%)
c.The most common chromosomal association is with
trisomy 13
d.mutation of
the sonic hedgehog gene (SHH) is implicated
e. The olfactory bulbs and tracts are almost always absent
10—e
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