Final answer:
The genetic code of humans is composed of over three billion DNA base pairs, can help explain genetic diseases, and is housed in 23 pairs of chromosomes.
Step-by-step explanation:
The genetic code of humans has several characteristics. Firstly, it contains over three billion base pairs of DNA, making up the human genome. Secondly, it can help explain genetic diseases, as genes on the chromosomes are responsible for determining the genotype and phenotype of individuals. Lastly, the genetic code is composed of 23 pairs of chromosomes, which carry thousands of genes that code for functional products.