Ablood test shows clumps only in wells containing anti-a and anti-b antibodies. the rhesus test was negative. which is the correct blood type? ~ a- ~ b+ ~ a+ ~ ab-

AB negative.

Explanation:

Four major types of blood group found in humans are A, B, AB and O. The rhesus factors determines whether the blood group is positive or negative. Karl Landsteiner explained the different types of blood group.

The blood test shows clumping in the wells with  anti-A and anti-B antibodies. The blood group is AB because AB blood group has both the antigens A and B, shows clumping in both the anti-A and anti-B antibodies. The rhesus test is negative indicates that the blood type is negative as the rhesus protein is absent on the surface of blood cells. Hence, the individual has AB- blood type.

Thus, the correct answer is option (4).

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