👉 Heterozygosis is a condition in which two copies of a gene are present, but one of them has an abnormal or recessive form. This means that there is no normal expression of the gene and it behaves as if it were missing. The person with the heterozygous genotype may have some symptoms similar to those of a homozygous dominant individual, although they would also show signs of genetic disorders. Heterozygosis can occur in various forms such as sickle