Mother and father of a person with ' O ' blood group have ' 
' and ' 
' blood group respectively. What would be the genotype of both mother and father?
'
' blood group and father is homozygous for ' 
'
' and ' 
' blood group respectively
' and ' 
' blood group respectively
Text Solution
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When a cross is carried out between heterozygous father (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 
and thus it shows phenomenon of multiple allelism. Both 
and 
are dominant over 
. 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.
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