SELECT * FROM question_mgmt as q WHERE id=424 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=3 AND subId=7 AND chapterId=30 and ex_no='1' AND status=1 ORDER BY CAST(question_no AS UNSIGNED) CBSE Free NCERT Solution of 12th biology Principles of Inheritance and Variation a child has blood group o if the father has blood

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, IA, IB, and i. The alleles, IA and IB, are equally dominant whereas allele, i, is recessive to the other alleles. The individuals with genotype, IA IA and IA i, have blood group A whereas the individuals with genotype, IB IB and IB i, have blood group B. The persons with genotype IA IB have 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

IA IA or IA i IB IB or IB 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 (IAIB) and O blood group (ii).

progenies with AB & O blood group


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