Question

What will be the genotype of parents of a child with ‘O’ blood group?
A) ${I^A}{I^A}$× ${I^A}{I^A}$
B) ${I^B}{I^B}$×${I^B}{I^B}$
C) ${I^A}{I^A}$×${I^B}{I^B}$
D) ${I^A}i$× ${I^B}i$

Answer 1

Hint: Let us understand what genotype is in an organism. In an organism the genotype is an organism's set of heritable genes that can be passed down from parents to offspring. The genes we see can take part in determining the characteristics that are observable in an organism, such as hair color, height, which is also visible to humans through eyes.

Complete answer:
When the blood group of parents is ${I^A}{I^A}$×${I^A}{I^A}$, the children's blood group is ‘A’. Therefore the required answer will not be acquired as the blood group O is not formed.

When the blood group of both parents is ${I^B}{I^B}$×${I^B}{I^B}$ the children's blood group is ‘B’. Therefore the required answer will not be obtained as the blood group ‘o ‘is not formed.

When the blood group of both parents is ${I^A}{I^A}$×${I^B}{I^B}$the children's blood group is ‘A’,’ B’ or ‘AB’. Therefore the blood group O is not acquired.

When the blood group of parents is ${I^A}i$× ${I^B}i$, the children blood group is
A, AB and O

Therefore, the correct option is ‘${I^A}i$×${I^B}i$. Option D

Note:
The requirement for the blood group O negative blood is the highest due to its most use often during emergencies.
The requirement for the O+ is high because it is the most frequently occurring blood type (37% of the population). All the time the universal red cell donor has Type O negative blood.
Universal plasma donors have Type AB blood as the person can donate the blood to any blood group.
The group O appeared to be associated with longer life expectancy. Findings of two studies performed on centenarians were contradictory.