This is an organism that has two different alleles for the same genetic trait.

Heterozygous organism

Explanation:

The gene consists of two alleles and these two alleles are responsible for certain characters or traits. The presence of same alleles that are responsible for a trait, such condition represents homozygous alleles and the presence of different alleles for same character represents heterozygous alleles. For example, PP gene is for color and P allele shows purple color. The organism is called Homozygous and for Pp gene, both alleles Pand p are for color and this is an hetrozygous organism that has two different alleles for the same genetic trait.

Heterozygous

Explanation:

An organism is said to be heterozygous when he has two different alleles of the same trait. A homozygous individual have the two same alleles for a given trait. For example, height is a trait which has two alleles that are T and t.

So in heterozygous individuals, two different alleles will be present which is Tt and in homozygous individual two same allele of height will be present that can be TT or tt.

In heterozygous condition normally one allele will be dominant and another allele will be recessive and in homozygous condition normally both the allele will be dominant or recessive. Therefore heterozygous is the organism that has two different alleles for the same trait.