Answer:
(c) When a cross is carried out
between heterozygous rather (for blood group B) and heterozygous mother (of
blood group A) to get four children with different blood groups.
All the four blood groups are controlled
by three allelic genes ,i and thus it
shows phenomenon of multiple allelism. Both and is dominant over
i. However, when together, both are dominant and show the phenomenon of
codominance forming the blood group AB. Six genotypes are possible with
combination of these three alleles .Thus, other option are wrong or incorrect.
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