35) Chimeras
Human chimerism is a rare condition where a person has two distinct sets of DNA within their body. This can lead to having two different types of red blood cells or variations in skin color. Essentially, chimeras have cells with different genetic makeup, which can result in noticeable differences like variations in blood type or skin pigmentation. This unique genetic situation occurs because the individual has two separate genetic lineages that mix in their body, creating these distinct biological traits.
