Answer:
Step-by-step explanation:
While it is true that animals also have different blood types, the number of blood types and the specific blood groups vary depending on the species. In humans, the most common blood type system is the ABO blood group system, which includes four main blood types: A, B, AB, and O. In contrast, some animal species have many more blood types, such as dogs which have over a dozen blood types.
The reason why different blood types exist in humans and animals is due to genetic variation. Blood type is determined by the presence or absence of specific proteins (antigens) on the surface of red blood cells. Different blood types arise from variations in the genes that control the production of these antigens.
In humans, the ABO blood group system is determined by three alleles of the ABO gene (IA, IB, and i), which code for the A, B, and O antigens respectively. Depending on which two alleles a person inherits from their parents, they can have blood type A, B, AB, or O. This variation in the ABO gene and other genes that control blood type in humans leads to different blood types.
Similarly, animals also have different blood types due to genetic variation, with different species having different blood group systems. For example, dogs have a blood group system that includes over a dozen different blood types, with variations in the genes that control the production of different antigens on the surface of their red blood cells.
In summary, both humans and animals have different blood types due to genetic variation, and the number and types of blood groups vary depending on the species.