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Question

Which of the following is a deviation from Mendelian principle ?
  1. Inheritance of flower colour in Mirabilis jalapa
  2. Inheritance of cotyledon colour in Pisum sativum
  3. Inheritance of AB blood groups in man
  4. Inheritance of AB blood group in man and flower colour in Mirabilis jalapa

A
Inheritance of AB blood groups in man
B
Inheritance of flower colour in Mirabilis jalapa
C
Inheritance of cotyledon colour in Pisum sativum
D
Inheritance of AB blood group in man and flower colour in Mirabilis jalapa
Solution
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Co-dominanceA B
A AA AB
B AB BB
Incomplete
dominance

R r
R RR Rr
r Rr rr
Inheritance of AB blood group in human follows co-dominance while inheritance of flower colour in Mirabilis jalapa follows incomplete dominance.
Co-dominance is a form of dominance where alleles of a gene pair in a heterozygote are fully expressed. In AB blood group, both A and B alleles are fully expressed. Therefore, an individual has neither A nor B blood group but AB blood group.
Incomplete dominance is a form of inheritance in which one allele for a specific trait is not completely expressed over its paired allele. In Mirabilis jalapa, plants with Rr genotype are not red (dominant allele) but pink (a third phenotype produced as a result of a combination of other two phenotypes).
So, the correct option is 'Inheritance of AB blood group in man and flower colour in Mirabilis jalapa'.

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