<P> The human genome is the complete set of nucleic acid sequences for humans , encoded as DNA within the 23 chromosome pairs in cell nuclei and in a small DNA molecule found within individual mitochondria . Human genomes include both protein - coding DNA genes and noncoding DNA . Haploid human genomes , which are contained in germ cells ( the egg and sperm gamete cells created in the meiosis phase of sexual reproduction before fertilization creates a zygote ) consist of three billion DNA base pairs , while diploid genomes ( found in somatic cells ) have twice the DNA content . While there are significant differences among the genomes of human individuals ( on the order of 0.1 % ) , these are considerably smaller than the differences between humans and their closest living relatives , the chimpanzees ( approximately 4 % ) and bonobos . </P>
<P> The human genome is the complete set of nucleic acid sequences for humans , encoded as DNA within the 23 chromosome pairs in cell nuclei and in a small DNA molecule found within individual mitochondria . Human genomes include both protein - coding DNA genes and noncoding DNA . Haploid human genomes , which are contained in germ cells ( the egg and sperm gamete cells created in the meiosis phase of sexual reproduction before fertilization creates a zygote ) consist of three billion DNA base pairs , while diploid genomes ( found in somatic cells ) have twice the DNA content . While there are significant differences among the genomes of human individuals ( on the order of 0.1 % ) , these are considerably smaller than the differences between humans and their closest living relatives , the chimpanzees ( approximately 4 % ) and bonobos . </P>
how many chromosomes are in the human genome
how many chromosomes are in the human genome
23 chromosome pairs
23 chromosome pairs