Genes and Alleles

A segment of DNA that codes for a trait

When an organism has two different alleles, it is called

These types of alleles are only expressed if the organism has two copies

This type of allele is expressed whether there are one or two copies present.

The genotype gg is best described as

The physical expression of a trait is known as

The genetic makeup of an organism is referred to as its

An allele that masks the effect of another allele is called

An allele that is masked by a dominant allele is called

If an organism has two identical alleles for a trait, it is said to be