no, it is a consensus sequence determined by sequencing the genomes of several individuals. i do not know how many individuals were sequenced for hg38, but hg37 was derived from 13 individuals according to [1].
genomic regions with higher variability between individuals are annotated separately and are not represented in the main chromosomal sequence, but can be aligned to it as such.
genomic regions with higher variability between individuals are annotated separately and are not represented in the main chromosomal sequence, but can be aligned to it as such.
[1] https://en.wikipedia.org/wiki/Reference_genome