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Law of Segregation

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Question

Find out the genotype of parents of a child with blood group O born to father with blood group A and mother with blood group B.

^{A}

^{O}

and I

^{B}

^{O}

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^{O}

^{O}

and I

^{A}

^{B}

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^{A}

^{A}

and I

^{B}

^{O}

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^{A}

^{O}

and I

^{B}

^{B}

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^{A}

^{A}

and I

^{B}

^{B}

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Solution

The correct option is A I $^{A}$ I $^{O}$ and I $^{B}$ I $^{O}$
The allele for O blood group ( $I^{O}$ ) is recessive to both $I^{A}$ and $I^{B}$ alleles. To have a child with O blood group ( $I^{O}$ $I^{O}$ ), both parents should have at least one copy of " $I^{O}$ " allele. So, the genotype of a father is $I^{A}$ $I^{O}$ and that of a mother is $I^{B}$ $I^{O}$ . Thus, the correct answer is A.

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Similar questions

A pregnant woman has an equal chance of her baby being blood group A or blood group AB. Which one of the following shows the possible genotypes of the woman and the father of her child ?

(a) $I^{A} I^{A} a n d I^{B} I^{O}$ (b) $I^{A} I^{B} a n d I^{B} I^{O}$ (c) $I^{A} I^{O} a n d I^{B} I^{O}$ (d) $I^{A} I^{B} a n d I^{A} I^{O}$

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Q. Alleles for gene I are

I^{A}, I^{B}

and

I^{O}

. If

I^{A}

and

I^{B}

are dominant over

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indicates _____________.

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