A child has blood group O. If the father | Class 12 Biology Chapter Principles of Inheritance and Variation, Principles of Inheritance and Variation NCERT Solutions

Question: A child has blood group O. If the father has blood group A and mother blood group B, work out the genotypes of the parents and the possible genotypes of the other offsprings.

Answer:

The blood group characteristic in humans is controlled by three set of alleles, namely, I^A, I^B, and i. The alleles, I^A and I^B, are equally dominant whereas allele, i, is recessive to the other alleles. The individuals with genotype, I^A I^A and I^A i, have blood group A whereas the individuals with genotype, I^B I^B and I^B i, have blood group B. The persons with genotype I^A I^Bhave blood group AB while those with blood group O have genotype ii.

Hence, if the father has blood group A and mother has blood group B, then the possible genotype of the parents will be

Father Mother

I^A I^A or I^A i I^B I^B or I^B i

A cross between homozygous parents will produce progeny with AB blood group.

progeny with AB blood group

A cross between heterozygous parents will produce progenies with AB blood group (I^AI^B) and O blood group (ii).

progenies with AB & O blood group

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Comments

Srishti
2019-06-13 21:10:18

Thank you

alanor george steward
2019-03-27 21:47:44

thank u.......

alanor george steward
2019-03-27 21:47:00

thanks .... seriously this is the very important question .....perhaps this question is being continuously asked for about 5 yrs........

Deepak
2019-03-08 23:16:51

ðthank u

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Welcome to the NCERT Solutions for Class 12 Biology - Chapter . This page offers a step-by-step solution to the specific question from Excercise 1 , Question 12: A child has blood group O. If the father has blood group A and mother blood group B, work out the ge....

A child has blood group O. If the father | Class 12 Biology Chapter Principles of Inheritance and Variation, Principles of Inheritance and Variation NCERT Solutions

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