A chromosome is a thread-like structure made up of DNA. Chromosomes are found in the nucleus of each cell.
Chromosome 1 is the largest chromosome in humans and has the most number of genes.
Two copies of chromosome 1, one copy inherited from each parent, form one of the pairs.
Chromosome 1 is the largest human chromosome, spanning about 249 million DNA building blocks (base pairs) and representing approximately 8 percent of the total DNA in cells.