From animals to plants to humans it defines us all

Information is stored in DNA using 4 types of molucules, which come in pairs

We have billions of these pairs

DNA folds itself into paired packages called chromosomes

Which are stored in the nucleus of cells

Each species has a different number of chromosomes

Humans have 46 chromosomes which contain our genes

Genes act as instructions for molecules called proteins

In humans, genes vary in size from a few hundred DNA bases to more than 2 million bases

And we have an estimated 20,000 to 25,000 of these genes passed during reproduction

Each person has two copies of each gene

One inherited from each parent

And most genes are the same in all people except for a small number of genes being slightly different

These small differences contribute to each person's unique physical characteristics

Varying from height, color and personality traits

Some genes are dominant and some are recessive

Dominant genes are most often expressed as observable charcterstics

While recessive genes are often masked by dominant genes

The recessive genes are expressed when inherited from both parents

While we share 98% of our DNA with bonobos and chimpanzees

We don't quite look alike because that 2% equals thousands and thousands of different genes

And while all humans share over 99% of our DNA with each other

What we don't share is what makes us unique in our own way

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