Genetics vocabulary

Front

What does homozygous mean?

Back

Having two of the same genes for a trait (sometimes called purebred).

Front

What is a phenotype?

Back

The physical appearance of a gene.

Front

What is an allele?

Back

One variation of a gene.

Front

What is an example of a phenotype?

Back

Black fur.

Front

What is a recessive allele?

Back

An allele whose trait only shows up when no dominant allele is present.

Front

What does heterozygous mean?

Back

Having two different copies of a gene.

Front

What is a dominant allele?

Back

An allele that expresses its trait even when only one copy is present.

Front

What is a genotype?

Back

The genetic makeup (code or letters) of an organism.

Front

What is the role of chromosomes?

Back

Structures that carry genetic information in the form of genes.

Front

What is a gene?

Back

A segment of DNA that codes for a specific trait.