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DNA Terms

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Adenine (A)


Cytosine (C)





Guanine (G)



Thymine (T)


Adenine (A) (n.)
One of the four nucleobases found in DNA. Adenine (A) always pairs with thymine (T).

Chromosomes (n. plural)
The part of the cell that contains DNA. Human cells contain 46 chromosomes (23 pairs) total.

Cytosine (C) (n.)
One of the four nucleobases found in DNA. Cytosine (C) always pairs with guanine (G).

DNA (n.)
Deoxyribonucleic acid. The genetic blueprint of all living things. Located in the nucleus of the cell, DNA carries the genetic information passed from parent to offspring that determines physical characteristics and other attributes. DNA is composed of nucleobases, sugars, and phosphates and is arranged in a double helix structure.



Dominant (adj.)
The description of a gene in a pair of genes that will produce a particular characteristic, regardless of the characteristic of the paired gene.

Genes (n. plural)
The coding part of the chromosome that provides instructions for the physical characteristics of the body.

Genetics (n.)
The study of inheritance and the variation of inherited characteristics.

Guanine (G) (n.)
One of the four nucleobases found in DNA. Guanine (G) always pairs with cytosine (C).



Heredity (n.)
The process of passing on physical characteristics from one generation to the next.

Recessive (adj.)
The description of a gene in a pair of genes that will not produce its specific characteristic unless paired with another recessive gene. If it is paired with a dominant gene, the recessive gene will not be expressed.

Thymine (T) (n.)
One of the four nucleobases found in DNA. Thymine (T) always pairs with adenine (A).





DNA Facts

DNA stands for DeoxyriboNucleic Acid.

DNA is found in every living thing.

DNA is inherited from our parents.

The structure of DNA is a double helix, so it looks like a spiral staircase.

DNA consists of bases, sugars, and phosphates.

The bases in DNA are adenine (A), guanine (G), thymine (T), and cytosine (C).

The bases exclusively pair as A to T and
C to G.


DNA is found in genes contained in chromosomes.

46 chromosomes are found in humans.

The number of chromosomes can vary from species to species.

The combination of bases is unique for every person except identical twins.

Identical twins have identical DNA profiles.

Children inherit half of their DNA from their mothers and half from their fathers.

Because DNA is unique for each person, it can be used to identify people.