Heterozygous <!-- google_ad_client = "ca-pub-2327677141881672"; /* Short title Links */ google_ad_slot = "3055805829"; google_ad_width = 468; google_ad_height = 15; //-->

When the two partner chromosomes have two different forms of a gene at the same point on each chromosome. One chromosome of a pair comes from the father and the other from the mother. The opposite of heterozygous is homozygous.