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

All animals have two gene copies, one from the mother and one from the father. If both copies of the gene are the same, then the individual is said to be homozygous for that gene. The opposite of homozygous is heterozygous.