NEET BIOLOGY

GENETICS AND EVOLUTION

GENETIC BASIS OF INHERITANCE

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
If a woman has type A blood and her child has type O blood, the father must have which of the following blood types?
A
A, B, or O
B
A or O
C
AB or B
D
O only
Explanation: 

Detailed explanation-1: -Usually, an AB parent and an A parent can only have children who are Type A or Type B. One exception is in certain Asian groups. Some of these folks have a rare version of the ABO blood type gene called cis-AB. People with this gene version have an AB blood type but can easily have an O child.

Detailed explanation-2: -One parent with A and another with B can produce a child with A, B, AB or O blood types. If one parent has A and another has AB, they can either produce a child with A, B or AB blood types.

Detailed explanation-3: -One parent with A and another with B will give their child either A, B, AB or O groups. One parent with A and another with AB will give their child either A, B or AB groups. One parent with A and another with O will give their child either A or O blood group.

Detailed explanation-4: -A mother who is blood type O can only pass an O allele to her son or daughter. A father who is blood type AB could pass either an A or a B allele to his son or daughter. This couple could have children of either blood type A (O from mother and A from father) or blood type B (O from mother and B from father).

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