Genes and Alleles

Front

What is a gene?

Back

A piece of DNA that contains the instructions for making a specific protein or trait.

Front

When an organism has two of the same alleles, it is called?

Back

Homozygous.

Front

What is the term for different forms of a gene?

Back

Alleles.

Front

What do we call the observable expression of a trait?

Back

Phenotype.

Front

What is the genetic makeup of an organism called?

Back

Genotype.

Front

Which is an example of a homozygous genotype?

Back

BB.

Front

What is the term for an organism with two different alleles for a trait?

Back

Heterozygous.

Front

What is the dominant allele?

Back

The allele that expresses its trait even when paired with a different allele.

Front

What is a recessive allele?

Back

The allele that only expresses its trait when two copies are present.

Front

What is the role of chromosomes in genetics?

Back

They carry genes and are made of DNA.