G E N O M E -The Book of Life

The human body contains approximately 100 trillion (million million) CELLS, most of which are less than a tenth of a millimetre across. Inside each cell there is a black blob called a NUCLEUS. Inside the nucleus are two comlete sets of the human GENOME (expect in egg cells and sperm cells, which have one copy each, and red blood cells, which have none). One set of the genome came from the mother and one from the father. In principle, each set includes the same 60,000-80,000 GENES on the same twenty-three CHROMOSOMES. In practice, there are often small and subtle differences between the paternal and maternal versions of each gene, differences that account for blue eyes or brown, for example. When we breed, we pass on one compete set , but only after swapping bits of the paternal and maternal chromosomes in a procedure known as RECOMBINATION.
Imagine that the genome is book.

There are twenty-three chapters, called CHROMOSOMES.

Each chapter contains several thousdand stories, called GENES.

Each story is made up of paragraphs, called EXONS,
which are interrupted by advertiesments called INTRONS.

Each paragraph is made up words, called CODONS.

Each words is written in letters called BASES.