DNA

What are the four bases?

Adenine, thymine, cytosine and guanine.

What does genetic code form?

The genome of an organism.

Where is DNA found?

In the nucleus, in long strands called chromosomes.

What forms the double helix shape?

Two twisted chromosome strands.

What are genes?

Sections of chromosomes that code how a person is.

What are the two base pairs?

Adenine and thymine, and guanine and cytosine.

What are bases made of?

Sugar and phosphates.

What is a phenotype?

A characteristic itself, such as blue eyes.

What is a genotype?

The letter representation of a characteristic, such as bb.

What does homozygous mean?

Both alleles are the same.

What does heterozygous mean?

The alleles are different and the dominant one will prevail.

What is a dominant allele?

An allele that will always affect the phenotype.

What is a recessive allele?

An allele that will only affect the phenotype if both alleles are recessive.

What are alleles?

Different versions of the same gene.

What do alleles cause?

Genetic variation.