👉 In genetics, a heterozygous individual has two copies of a gene (two alleles), one of which is expressed in normal function. In other words, it's like having two identical twins, but they're not identical. This means that both their traits are the same, and there is no difference between them.
For example, if you have a person who has two identical copies of a gene (a heterozygous individual), this means that they are both carriers for the disease or
heterozygous