The eggs and sperm are the repr oductive cells. Each
mature reproductive cell is haploid in that it has a single set of 23 chromosomes
containing half the usual amount of DNA.
Except for the eggs and sperm, each cell in the human body -- there are 100 trillion
cells in each of us -- contains the entire human genome, all the genetic information
necessary to build a human being, and this information is encoded within the cell
nucleus in 6 billion base pairs, subunits of DNA, packaged in 23 pairs of chromosomes,
one chromosome in each pair coming from each parent.
The reproductive cells -- the eggs and sperm -- are thus notable exceptions to
the usual rules concerning chromosomes, genes, and DNA.
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