Which was the last human chromosome to be completely sequenced:
a. Chromosome 1
b. Chromosome 11
c. Chromosome 21
d. Chromosome X
The answer is the option (a) Chromosome 1
The final human chromosome to be fully sequenced was chromosome 1, which was finished in May 2006. Out of the 24 human chromosomes, 22 autosomes, and X and Y, it was the final one to be sequenced. Hence, (a) is the correct option.