Heterozygous

• pertaining to two different alleles at a specific locus in a diploid organism
  Source: Jenkins, John B. 1990. Human Genetics, 2nd Edition. New York: Harper & Row
• Heterozygous refers to having inherited different forms of a particular gene from each parent. A heterozygous genotype stands in contrast to a homozygous genotype, where an individual inherits identical forms of a particular gene from each parent.