Frequently asked questions about the human genome

Q: How many chromosomes are there in the human genome?
A: There are 22 autosomal chromsomes, 2 sex chromosomes, X and Y, and one circular mitochondrial chromosome.

Q: What is the size of each chromosome?

Chrom hg19 Size (MB) hg19 Mappable (MB) hg19 % Mappable hg38 Size (MB) hg38 Mappable (MB) hg38 % Mappable