The genotype of this variant call. Each value represents either the value
referenceBases field or a 1-based index into
alternateBases. If a variant had a
T and an
["A", "C"], and the
[2, 1], that would mean the call
represented the heterozygous value
CA for this variant.
genotype was instead
[0, 1], the
represented value would be
TA. Ordering of the
genotype values is important if the
phaseset is present.
If a genotype is not called (that is, a
. is present in the
GT string) -1 is returned.