[Answer] Which chromosome has the smallest number of genes?

Answer: Y chromosome

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Which chromosome has the smallest number of genes? Chromosome 21 - Wikipedia 3.9: Human Chromosomes and Genes - Biology LibreTe... Autosome - Genome.gov Autosome - Genome.gov That is Chromosome 1 with the smallest number is actually the largest chromosome. It has almost 3 000 genes on it. And we go down to the smallest chromosomes the ones with the largest numbers. You think that would be Chromosome 22 since we have Chromosomes 1 through 22 which only has about 750 genes but in fact Chromosome number 22 is not the smallest of the autosomes. Chromosome 21 is one of the 23 pairs of chromosomes in humans. Chromosome 21 is both the smallest human autosome and chromosome with 48 million base pairs (the building material of DNA) representing about 1.5 percent of the total DNA in cells. Most people have two copies of chromosome 21 while those with three copies of chromosome 21 have Down syndrome also called "trisomy 21". Researchers working on the Human Genome Projectannounced in May 2000 that they had determined … Chromosome 22 is one of the 23 pairs of chromosomes in human cells. Humans normally have two copies of chromosome 22 in each cell. Chromosome 22 is the second smallest human chromosome spanning about 49 million DNA base pairs and representing between 1.5 and 2% of the total DNA in cells. In 1999 researchers working on the Human Genome Projectannounced they ha...

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